Unexpected Synthesis of Rearranged 3,4-Dihydroquinazolines by a Sequential Ugi 4CC/Aza-Wittig/Carbodiimide-Mediated Cyclization

The 2,3,4-trisubstituted 3,4-dihydroquinazolines 4 were unexpectedly obtained from a sequential Ugi four component condensation (4CC)/aza-Wittig/carbodiimide-mediated cyclization.