Carboxyl-modified amino acids and peptides: I) An efficient method for the synthesis of monofunctionalized enamines and monofunctionalized methyl ketone derivatives from thioamides via episulfides and thioiminium salts
作者:Gilles Sauvé、Tarek S. Mansour、Paule Lachance、Bernard Belleau
DOI:10.1016/s0040-4039(00)86041-4
日期:1988.1
Thioamides 4 were transformed by two convenient routes to various functionalized enamines 7 containing different electron-withdrawing groups E which on subsequent hydrolysis gave the corresponding methyl ketone derivatives 8. Application of this methodology to obtain modified dipeptides at the carboxyl end, the determination of stereochemistry and the degree of racemization are discussed.
硫酰胺4通过两种方便的途径转化为各种官能化的烯胺7,这些烯胺7含有不同的吸电子基团E,在随后水解时得到相应的甲基酮衍生物8。讨论了该方法在羧基端修饰二肽的应用,立体化学的确定和外消旋度。