char = 2;code = 50 char = ,;code = 44 char = 6;code = 54 char = -;code = 45 char = D;code = 68 char = i;code = 105 char = k;code = 107 char = e;code = 101 char = t;code = 116 char = o;code = 111 char = p;code = 112 char = i;code = 105 char = p;code = 112 char = e;code = 101 char = r;code = 114 char = a;code = 97 char = z;code = 122 char = i;code = 105 char = n;code = 110 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = f;code = 102 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = ;code = 32 char = a;code = 97 char = m;code = 109 char = i;code = 105 char = n;code = 110 char = o;code = 111 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = i;code = 105 char = d;code = 100 char = s;code = 115 char = ,;code = 44 char = ;code = 32 char = f;code = 102 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = -;code = 45 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = i;code = 105 char = d;code = 100 char = -;code = 45 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = r;code = 114 char = g;code = 103 char = a;code = 97 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = s;code = 115 char = y;code = 121 char = n;code = 110 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = s;code = 115 char = i;code = 105 char = s;code = 115 char = .;code = 46 result sql = 2,6-Diketopiperazines from amino acids, from solution-phase to solid-phase organic synthesis.
2,6-Diketopiperazines from amino acids, from solution-phase to solid-phase organic synthesis.char = A;code = 65 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = t;code = 116 char = h;code = 104 char = o;code = 111 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = e;code = 101 char = p;code = 112 char = a;code = 97 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = 1;code = 49 char = ,;code = 44 char = 3;code = 51 char = -;code = 45 char = d;code = 100 char = i;code = 105 char = s;code = 115 char = u;code = 117 char = b;code = 98 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = t;code = 116 char = u;code = 117 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = 2;code = 50 char = ,;code = 44 char = 6;code = 54 char = -;code = 45 char = d;code = 100 char = i;code = 105 char = k;code = 107 char = e;code = 101 char = t;code = 116 char = o;code = 111 char = p;code = 112 char = i;code = 105 char = p;code = 112 char = e;code = 101 char = r;code = 114 char = a;code = 97 char = z;code = 122 char = i;code = 105 char = n;code = 110 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = (;code = 40 char = 2;code = 50 char = ,;code = 44 char = 6;code = 54 char = -;code = 45 char = D;code = 68 char = K;code = 75 char = P;code = 80 char = );code = 41 char = ;code = 32 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = u;code = 117 char = s;code = 115 char = e;code = 101 char = f;code = 102 char = u;code = 117 char = l;code = 108 char = ;code = 32 char = h;code = 104 char = e;code = 101 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = o;code = 111 char = c;code = 99 char = y;code = 121 char = c;code = 99 char = l;code = 108 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = l;code = 108 char = i;code = 105 char = b;code = 98 char = r;code = 114 char = a;code = 97 char = r;code = 114 char = y;code = 121 char = ;code = 32 char = s;code = 115 char = c;code = 99 char = a;code = 97 char = f;code = 102 char = f;code = 102 char = o;code = 111 char = l;code = 108 char = d;code = 100 char = s;code = 115 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = s;code = 115 char = e;code = 101 char = a;code = 97 char = r;code = 114 char = c;code = 99 char = h;code = 104 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = n;code = 110 char = e;code = 101 char = w;code = 119 char = ;code = 32 char = l;code = 108 char = e;code = 101 char = a;code = 97 char = d;code = 100 char = s;code = 115 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = d;code = 100 char = r;code = 114 char = u;code = 117 char = g;code = 103 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = s;code = 115 char = c;code = 99 char = o;code = 111 char = v;code = 118 char = e;code = 101 char = r;code = 114 char = y;code = 121 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = s;code = 115 char = c;code = 99 char = r;code = 114 char = i;code = 105 char = b;code = 98 char = e;code = 101 char = d;code = 100 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = t;code = 116 char = h;code = 104 char = o;code = 111 char = d;code = 100 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = b;code = 98 char = e;code = 101 char = ;code = 32 char = u;code = 117 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = -;code = 45 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = i;code = 105 char = d;code = 100 char = -;code = 45 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = d;code = 100 char = i;code = 105 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = .;code = 46 char = ;code = 32 char = I;code = 73 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = k;code = 107 char = e;code = 101 char = y;code = 121 char = ;code = 32 char = s;code = 115 char = t;code = 116 char = e;code = 101 char = p;code = 112 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = s;code = 115 char = y;code = 121 char = n;code = 110 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = s;code = 115 char = i;code = 105 char = s;code = 115 char = ,;code = 44 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = m;code = 109 char = i;code = 105 char = d;code = 100 char = o;code = 111 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = r;code = 114 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = n;code = 110 char = e;code = 101 char = w;code = 119 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = l;code = 108 char = e;code = 101 char = c;code = 99 char = u;code = 117 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = m;code = 109 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = r;code = 114 char = o;code = 111 char = u;code = 117 char = g;code = 103 char = h;code = 104 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = m;code = 109 char = o;code = 111 char = l;code = 108 char = e;code = 101 char = c;code = 99 char = u;code = 117 char = l;code = 108 char = a;code = 97 char = r;code = 114 char = ;code = 32 char = c;code = 99 char = y;code = 121 char = c;code = 99 char = l;code = 108 char = i;code = 105 char = z;code = 122 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ,;code = 44 char = ;code = 32 char = u;code = 117 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = b;code = 98 char = a;code = 97 char = s;code = 115 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = d;code = 100 char = i;code = 105 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = ,;code = 44 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = s;code = 115 char = e;code = 101 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = d;code = 100 char = a;code = 97 char = r;code = 114 char = y;code = 121 char = ;code = 32 char = a;code = 97 char = m;code = 109 char = i;code = 105 char = d;code = 100 char = e;code = 101 char = ;code = 32 char = n;code = 110 char = i;code = 105 char = t;code = 116 char = r;code = 114 char = o;code = 111 char = g;code = 103 char = e;code = 101 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = b;code = 98 char = e;code = 101 char = n;code = 110 char = z;code = 122 char = y;code = 121 char = l;code = 108 char = ;code = 32 char = e;code = 101 char = s;code = 115 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = .;code = 46 char = ;code = 32 char = A;code = 65 char = ;code = 32 char = W;code = 87 char = a;code = 97 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = r;code = 114 char = b;code = 98 char = o;code = 111 char = x;code = 120 char = y;code = 121 char = l;code = 108 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = e;code = 101 char = s;code = 115 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = u;code = 117 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = y;code = 121 char = l;code = 108 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = a;code = 97 char = g;code = 103 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = u;code = 117 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = i;code = 105 char = d;code = 100 char = -;code = 45 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = d;code = 100 char = i;code = 105 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = ,;code = 44 char = ;code = 32 char = a;code = 97 char = l;code = 108 char = l;code = 108 char = o;code = 111 char = w;code = 119 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = y;code = 121 char = c;code = 99 char = l;code = 108 char = i;code = 105 char = z;code = 122 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = t;code = 116 char = a;code = 97 char = k;code = 107 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = l;code = 108 char = a;code = 97 char = c;code = 99 char = e;code = 101 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = s;code = 115 char = i;code = 105 char = m;code = 109 char = u;code = 117 char = l;code = 108 char = t;code = 116 char = a;code = 97 char = n;code = 110 char = e;code = 101 char = o;code = 111 char = u;code = 117 char = s;code = 115 char = ;code = 32 char = c;code = 99 char = l;code = 108 char = e;code = 101 char = a;code = 97 char = v;code = 118 char = a;code = 97 char = g;code = 103 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = o;code = 111 char = d;code = 100 char = u;code = 117 char = c;code = 99 char = t;code = 116 char = ;code = 32 char = f;code = 102 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = (;code = 40 char = ";code = 34 char = c;code = 99 char = y;code = 121 char = c;code = 99 char = l;code = 108 char = o;code = 111 char = c;code = 99 char = l;code = 108 char = e;code = 101 char = a;code = 97 char = v;code = 118 char = a;code = 97 char = g;code = 103 char = e;code = 101 char = ";code = 34 char = );code = 41 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = s;code = 115 char = y;code = 121 char = n;code = 110 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = t;code = 116 char = h;code = 104 char = o;code = 111 char = d;code = 100 char = ;code = 32 char = w;code = 119 char = o;code = 111 char = r;code = 114 char = k;code = 107 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = w;code = 119 char = e;code = 101 char = l;code = 108 char = l;code = 108 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = s;code = 115 char = e;code = 101 char = v;code = 118 char = e;code = 101 char = r;code = 114 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = u;code = 117 char = p;code = 112 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = m;code = 109 char = i;code = 105 char = n;code = 110 char = o;code = 111 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = i;code = 105 char = d;code = 100 char = s;code = 115 char = ,;code = 44 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = p;code = 112 char = e;code = 101 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = f;code = 102 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = i;code = 105 char = r;code = 114 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = f;code = 102 char = i;code = 105 char = g;code = 103 char = u;code = 117 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ,;code = 44 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = u;code = 117 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = a;code = 97 char = r;code = 114 char = a;code = 97 char = l;code = 108 char = l;code = 108 char = e;code = 101 char = l;code = 108 char = ;code = 32 char = s;code = 115 char = y;code = 121 char = n;code = 110 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = s;code = 115 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = s;code = 115 char = e;code = 101 char = r;code = 114 char = i;code = 105 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = f;code = 102 char = u;code = 117 char = l;code = 108 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = a;code = 97 char = r;code = 114 char = a;code = 97 char = c;code = 99 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = i;code = 105 char = z;code = 122 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = m;code = 109 char = p;code = 112 char = o;code = 111 char = u;code = 117 char = n;code = 110 char = d;code = 100 char = s;code = 115 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = u;code = 117 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = i;code = 105 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = v;code = 118 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = d;code = 100 char = i;code = 105 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = i;code = 105 char = d;code = 100 char = ;code = 32 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = (;code = 40 char = r;code = 114 char = e;code = 101 char = p;code = 112 char = e;code = 101 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = d;code = 100 char = d;code = 100 char = i;code = 105 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = f;code = 102 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = h;code = 104 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = v;code = 118 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = t;code = 116 char = a;code = 97 char = s;code = 115 char = s;code = 115 char = i;code = 105 char = u;code = 117 char = m;code = 109 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = r;code = 114 char = b;code = 98 char = o;code = 111 char = n;code = 110 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = a;code = 97 char = f;code = 102 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = f;code = 102 char = i;code = 105 char = l;code = 108 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = o;code = 111 char = u;code = 117 char = t;code = 116 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = o;code = 111 char = d;code = 100 char = u;code = 117 char = c;code = 99 char = t;code = 116 char = -;code = 45 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = t;code = 116 char = a;code = 97 char = i;code = 105 char = n;code = 110 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = );code = 41 char = ;code = 32 char = a;code = 97 char = l;code = 108 char = l;code = 108 char = o;code = 111 char = w;code = 119 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = u;code = 117 char = s;code = 115 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = k;code = 107 char = e;code = 101 char = e;code = 101 char = p;code = 112 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = s;code = 115 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = e;code = 101 char = o;code = 111 char = i;code = 105 char = s;code = 115 char = o;code = 111 char = m;code = 109 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = t;code = 116 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = b;code = 98 char = e;code = 101 char = l;code = 108 char = o;code = 111 char = w;code = 119 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = t;code = 116 char = e;code = 101 char = c;code = 99 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = l;code = 108 char = i;code = 105 char = m;code = 109 char = i;code = 105 char = t;code = 116 char = ;code = 32 char = b;code = 98 char = y;code = 121 char = ;code = 32 char = H;code = 72 char = P;code = 80 char = L;code = 76 char = C;code = 67 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = (;code = 40 char = 1;code = 49 char = );code = 41 char = H;code = 72 char = ;code = 32 char = N;code = 78 char = M;code = 77 char = R;code = 82 char = ;code = 32 char = (;code = 40 char = 2;code = 50 char = 0;code = 48 char = 0;code = 48 char = ;code = 32 char = M;code = 77 char = H;code = 72 char = z;code = 122 char = );code = 41 char = .;code = 46 char = <;code = 60 char = b;code = 98 char = r;code = 114 char = /;code = 47 char = >;code = 62 result sql = A method to prepare 1,3-disubstituted 2,6-diketopiperazines (2,6-DKP) as useful heterocyclic library scaffolds in the search of new leads for drug discovery is described. The method can be used in solution-phase and solid-phase conditions. In the key step of the synthesis, the imido portion of the new molecule is formed in solution through intramolecular cyclization, under basic conditions, of a secondary amide nitrogen on a benzyl ester. A Wang resin carboxylic ester is used as the acylating agent under solid-phase conditions, allowing the cyclization to take place with simultaneous cleavage of the product from the resin ("cyclocleavage"). The synthetic method worked well with several couples of amino acids, independently from their configuration, and was used for the parallel synthesis of a series of fully characterized compounds. The use of iterative conditions in the solid phase (repeated addition of fresh solvent and potassium carbonate to the resin after filtering out the product-containing solution) allowed us to keep diastereoisomer content below the detection limit by HPLC and (1)H NMR (200 MHz).
Publication: J Comb Chem 2001 Sep-Oct ;3(5)::453-60.
Publication Date: 2001 Sep-Oct
Study Author(s): Perrotta, E;Altamura, M;Barani, T;Bindi, S;Giannotti, D;Harmat, N J;Nannicini, R;Maggi, C A;
Institution: Department of Chemistry, Menarini Ricerche S.p.A., I-50131 Firenze, Italy.
Shortcut link to this study:
A method to prepare 1,3-disubstituted 2,6-diketopiperazines (2,6-DKP) as useful heterocyclic library scaffolds in the search of new leads for drug discovery is described. The method can be used in solution-phase and solid-phase conditions. In the key step of the synthesis, the imido portion of the new molecule is formed in solution through intramolecular cyclization, under basic conditions, of a secondary amide nitrogen on a benzyl ester. A Wang resin carboxylic ester is used as the acylating agent under solid-phase conditions, allowing the cyclization to take place with simultaneous cleavage of the product from the resin ("cyclocleavage"). The synthetic method worked well with several couples of amino acids, independently from their configuration, and was used for the parallel synthesis of a series of fully characterized compounds. The use of iterative conditions in the solid phase (repeated addition of fresh solvent and potassium carbonate to the resin after filtering out the product-containing solution) allowed us to keep diastereoisomer content below the detection limit by HPLC and (1)H NMR (200 MHz).
PMID: 11549363