Ring-fused gem-dibromocyclopropanes as precursors to enantiomerically pure D- and L-series 3-deoxy- and 2-amino-2,3-dideoxyaldohexose derivatives
作者:Martin G. Banwell、Wolfgang Ebenbeck、Alison J. Edwards
DOI:10.1039/b008146i
日期:——
The readily available gem-dibromocyclopropanes 5 and 6 undergo silver(I)-promoted electrocyclic ring-opening and the resulting π-allyl cations trapped with a range of nucleophiles to give mixtures of cyclohexenyl bromides such as 7–9 and 17–19, respectively. Subjection of certain of these products to ozonolytic cleavage followed by reduction protocols then affords differentially protected and enantiopure
容易获得的宝石-二溴环丙烷5和6经过银(I)促进的电环开环,并生成π-烯丙基阳离子被一系列亲核试剂捕获,分别得到环己烯基溴化物的混合物,例如7-9和17-19。这些产品中的某些经过臭氧分解后,随后减少然后,该方案提供了差异保护的和对映体纯的D和L系列3-脱氧和2-氨基-2,3-二脱氧醛糖己糖。