Diastereoselective Imino-Aldol Condensation of Chiral 3-(p-Tolylsulfinyl)-2-furaldimine and Ester Enolates.
作者:Yoshitsugu Arai、Shinya Yoneda、Tsutomu Masuda、Yukio Masaki
DOI:10.1248/cpb.50.615
日期:——
and condensation of the chiral furaldimine with lithium ester enolates has been examined. The product distribution of the reaction is dependent upon reaction conditions and on the kind of the substituent placed on the esters. Disubstituted ester enolate resulted in the exclusive formation of (4R)-beta-lactam, while unsubstituted, tert-butyl ester enolate preferentially gave (3R)-beta-amino ester. With
合成了(Ss)-3-(对甲苯基亚磺酰基)-2-呋喃二胺,并且已经研究了手性呋喃二胺与锂酯烯醇盐的缩合。反应的产物分布取决于反应条件和位于酯上的取代基的种类。二取代的酯烯酸酯导致(4R)-β-内酰胺的排他性形成,而未取代的叔丁基酯烯酸酯则优先产生(3R)-β-氨基酯。用单取代的酯烯酸酯,缩合得到主要产物(4R)-β-内酰胺和/或(3R)-β-氨基酯。该方法已应用于手性呋喃基β-内酰胺的有效途径。