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Synthesis of 2-Alkylamino-thieno[2,3-d] pyrimidin-4(3H)-ones

SUN Shao-fa,MAO Yan-ping,GU Wen-jie (Department of Chemistry and Life Science,Xianning University,Xianning 437100,China)  
The carbodiimides 3,obtained from aza-Wittig reactions of iminophosphorane 2 with aromatic isocyanates,reacted with primary amines to give selectively 2-alkylamino substituted thieno[2,3-d] pyrimidin-4(3H)-ones 5 in presence of catalytic amount of EtO-Na+.The selectivity of the cyclization was discussed.
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