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7-Benzyl-5,6,7,8-tetrahydropyrido[4′,3′:4,5]thieno[2,3- d ]pyrimidin-4(3 H )-ones were synthesized by base catalyzed reactions of nucleophilic reagents (aliphatic amines, alcohols or phenols) with carbodiimides  4 , which in turn were obtained by the aza-Wittig reaction of iminophosphoranes  3  with aromatic isocyanates.

Efficient synthesis of thieno[2,3- d ]pyrimidin-4(3 H )-ones by a sequential aza-Wittig reaction/base catalyzed cyclization