5,6-Dihydrothieno[3′,2′:4,5]thieno[2,3-d]pyrimidin-4(3H)-ones 6 were synthesized in yields of 71–87% by a consecutive method, which includes aza-Wittig reaction of iminophosphorane 3 with aromatic isocynate to give carbodiimide 4 and subsequent reaction of 4 with various amines, phenols or alcohols in the presence of catalytic amount of sodium ethoxide or solid potassium carbonate.

中文翻译：

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通过亚氨基磷烷有效合成5,6-dihydrothieno [3'，2'：4,5] thieno [2,3 - d ]嘧啶-4（3 H）-ones

通过连续方法合成了5,6-二氢噻吩并[3'，2'：4,5]噻吩并[2,3- d ]嘧啶-4（3 H）-一6，产率为71-87％，包括亚氨基磷烷3与芳族异氰酸酯的aza-Wittig反应生成碳二亚胺4，随后4在催化量的乙醇钠或固体碳酸钾存在下，4与各种胺，酚或醇的反应。