Synthesis of Aryl, Glycosyl, and Azido Septanosides through Ring Expansion of 1,2-Cyclopropanated Sugars
作者:N. Vijaya Ganesh、N. Jayaraman
DOI:10.1021/jo801967s
日期:2009.1.16
septanosides, arabinofuranosyl and glucopyranosyl septanoside disaccharides, and azido septanosides is reported. A cyclopropanated adduct of the oxyglycal upon reaction with phenols, sugars, and azide led to the formation of ring-expanded septanoside derivatives. The ring expansion was found to be stereoselective with sugars, whereas phenols and the azide afforded an anomeric mixture of the ring expanded
报道了一种用于制备芳基Septanosides,阿拉伯呋喃糖基和吡喃葡萄糖基Septanoside二糖和叠氮基Septanosides的扩环方法。与苯酚,糖和叠氮化物反应后,氧丙二醇的环丙烷化加合物导致形成环膨胀的番石榴糖苷衍生物。发现扩环对糖是立体选择性的,而酚和叠氮化物提供了扩环产物的异头混合物。进一步观察到,使用NaBH 4将中间二酮转化为二醇,对于隔酒苷的α-端异构体具有很高的非对映选择性。该报告进一步巩固了氧糖环扩环方法的通用性,以制备在其还原端具有不同取代基的Septanosides。