An efficient method for the synthesis of thieno[3′,2′:2,3]pyrido-[4,5-d]-thiazolo[3,2-a]pyrimidinones
作者:Dao-Lin Wang、Dong Wang、Jin-Juan Xing、Jian-Hua Qian
DOI:10.1016/j.cclet.2016.11.024
日期:2017.3
An efficient method for the preparation of thieno[3′,2′:2,3]pyrido[4,5-d]thiazolo[3,2-a] pyrimidin-5-ones 5 is described. The key intermediate, 7-(3-amino-4-cyano-5-phenyl aminothieno-2-yl)-5H-thiazolo-[3,2-a]pyrimidin-5-one (3), was synthesized from 7-chloromethyl-5H-thiazolo[3,2-a]pyrimidin-5-one (1) with potassium-(2,2-dicyano-1-phenylaminoethen-1-yl)thiolate (2) by Thorpe–Ziegler isomerization
描述了一种制备噻吩并[3',2':2,3]吡啶并[4,5-d]噻唑并[3,2-a]嘧啶-5-酮5的有效方法。关键中间体7-(3-氨基-4-氰基-5-苯基氨基噻吩-2-基)-5H-噻唑基-[3,2-a]嘧啶-5-酮(3)是由7-通过Thorpe-Ziegler异构化反应,将氯甲基5H-噻唑并[3,2-a]嘧啶-5-酮(1)与(-2,2-二氰基-1-苯基氨基乙烯-1-基)硫醇钾(2)结合。随后,通过Pictet-Spengler反应,中间体胺与芳族醛的反应提供了噻吩并吡啶稠合的噻唑并[3,2-a]嘧啶在催化剂上的产率很高。