Fluoride Anions in Self-Assembled Chiral Cage for the Enantioselective Protonation of Silyl Enol Ethers
作者:Sushovan Paladhi、Yidong Liu、B. Senthil Kumar、Min-Jung Jung、Sang Yeon Park、Hailong Yan、Choong Eui Song
DOI:10.1021/acs.orglett.7b01429
日期:2017.6.16
The potential of Song’s chiral oligoethylene glycols (oligoEGs) as catalysts was explored in the enantioselective protonation of trimethylsilyl enol ethers in combination with alkali metal fluoride (KF and CsF) and in the presence of a proton source. Highly enantioselective protonations of various silyl enol ethers of α-substituted tetralones were achieved, producing chiral α-substituted tetralones
Song的手性低聚乙二醇(oligoEGs)作为催化剂的潜力已在三甲基甲硅烷基烯醇醚与碱金属氟化物(KF和CsF)结合以及质子源存在下的对映选择性质子化中得到了探索。获得了α-取代的四氢萘酮的各种甲硅烷基烯醇醚的高度对映选择性质子化,以完全转化并具有高达99%的ee产生了手性α-取代的四氢萘酮。已建立的协议已成功扩展到生物相关的手性α-取代的苯并二氢吡喃酮和硫代苯并二氢吡喃酮衍生物的合成。