Catalytic Enantioselective Protonation of Enol Trifluoroacetates by Means of Hydrogenocarbonates and Cinchona Alkaloids
作者:Aurélie Claraz、Jérôme Leroy、Sylvain Oudeyer、Vincent Levacher
DOI:10.1021/jo201146b
日期:2011.8.5
Herein is disclosed an efficient catalytic enantioselective protonation of enol acetates by means of a readily implementable transition-metal-free chemical process. By making use of simple hygrogenocarbonates as the proton source and hydroquinine anthraquinone-1,4-diyl diether as the chiral proton shuttle, a series of cyclic enol trifluoroacetates are protonated under mild conditions to yield the corresponding
本文公开了通过易于实施的无过渡金属的化学方法对烯醇乙酸酯的有效催化对映选择性质子化。通过使用简单的碳酸氢根作为质子源,并使用氢醌-1,4-二基二氢蒽醌作为手性质子穿梭剂,在温和条件下对一系列环状烯醇三氟乙酸酯进行质子化反应,制得相应的酮,其收率高达93%ee。