Efficient synthesis of 2-substituted thieno[2,3-d]pyrimidin-4(3H)-ones via an iminophosphorane
作者:Zheng-Dong Fang、Yang-Gen Hu、Ming-Wu Ding
DOI:10.1002/hc.20424
日期:2008.4
with secondary amines to give 2-dialkylamino-5-ethyl-6-methyl-thieno[2,3-d]pyrimidin-4(3H)-ones 6 in the presence of catalytic amount of EtONa. Reactions of 4 with phenols or ROH in the presence of the catalytic amount of K2CO3 or RONa gave 2-aryloxy- or 2-alkoxy-5-ethyl-6-methyl-thieno[2,3-d]pyrimidin-4(3H)-ones 6 in satisfactory yields. The effects of the nucleophiles on cyclization have been investigated