1: Et2NH 2: (benzotriazol-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate, DIEA 3: Et2NH 4: (benzotriazol-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate, DIEA 5: 97 percent 6: 96 percent / DABCO, Et2NH 7: 98 percent / (benzotriazol-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate, DIEA 8: 93 percent / LiOH 9: 62 percent / DIAD, PPh3, TsOH*H2O / tetrahydrofuran / 2 h / 0 °C 10: 84 percent / I2 / methanol; H2O View Scheme