A new multicomponent synthesis of 2-aminothiophene carbocyclic acids 4 by reaction of methyl 2-siloxycyclopropane-carboxylates 1, alkyl cyanoacetates, and elemental sulfur is reported. This version of the Gewald thiophene synthesis rapidly provides a new type of δ-amino acids, which can be considered as dipeptide analogues. Smooth protective-group manipulations allowed regio- and chemoselective couplings with l-phenylalanine derivatives furnishing new tripeptide analogues such as 5 and 8 or products of type 10.
报道了一种新的多组分合成2-
氨基
噻吩碳
环酸4的方法,该方法通过甲基2-
硅氧基
环丙烷羧酸酯1、烷基
氰基
乙酸酯和元素
硫的反应实现。这种改进的Gewald
噻吩合成法迅速提供了一种新型的δ-
氨基酸,这些
氨基酸可被视为二肽的类似物。通过顺利的保护基操作,实现了与
L-苯丙氨酸衍
生物的区域选择性和
化学选择性偶联,从而得到了如5和8等新型三肽类似物或10型产物。