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
由亚
氨基正膦 3 与芳香
异氰酸酯反应得到的碳二
亚胺 4 与仲胺反应得到 2-二烷基
氨基-5-乙基-6-甲基-
噻吩并[2,3-d]
嘧啶-4(3H)-ones 6在催化量的 EtONa 存在下。在催化量的 K2CO3 或 RONa 存在下,4 与
苯酚或 ROH 反应得到 2-芳氧基-或 2-烷氧基-5-乙基-6-甲基-
噻吩并[2,3-d]
嘧啶-4(3H) -ones 6 的产量令人满意。已经研究了亲核试剂对环化的影响。© 2008 Wiley Periodicals, Inc. 杂原子
化学 19:266–270, 2008; 在线发表于 Wiley InterScience (www.interscience.wiley.com)。DOI 10.1002/hc.20424