β-<scp>l</scp>-Rhamnosylation and β-<scp>d</scp>-Mannosylation Mediated by 4-<i>O</i>-Ester Groups in a Weakly Nucleophilic Environment
作者:Yongliang Zhang、Changsheng Chen、Yongtao Gao、Min Yang、Zehuan He、Bangzhi Zhang、Guofeng Gu、Bencan Tang、Feng Cai
DOI:10.1021/acs.orglett.3c02566
日期:2023.10.6
eq-4-O-Acyl group directed β-rhamnosylation and β-mannosylation are achieved in a carborane or BARF anion formed weakly nucleophilic environment with the assistance of a 2,3-orthocarbonate group. The 4-O-acyl group plays a critical role in directing the β-selectivity, and the weakly coordinating anion is essential to amplify this direction. The orthocarbonate group could be readily removed with 1,3-propanediol