Copper-Catalyzed Regio- and Enantioselective Synthesis of Chiral Enol Acetates and β-Substituted Aldehydes
作者:Martín Fañanás-Mastral、Ben L. Feringa
DOI:10.1021/ja105585y
日期:2010.9.29
The in situ transformation of α,β-unsaturated aldehydes into α-chloroallylic acetates and subsequent copper-catalyzed regio- and enantioselective (up to 94% ee) allylic alkylation with Grignard reagents provides chiral enol acetates and chiral β-substituted aldehydes in a one-pot protocol.
been synthesized in 36–50% total yield using the enantiomers of 2-methyloxiraneoxide as chiral sources. The key steps of this strategy involved CuI catalyzed ring-opening of chiral 2-methyloxiraneoxide, stereospecific inversion of secondary tosylate and Wittig coupling of the aldehyde with chiral phosphonium salt. The synthetic pheromones would be used to monitor and control this pest.
西部铁杉尺蠖是一种经济上重要的针叶树脱叶剂。使用 2-methyloxiraneoxide 的对映异构体作为手性来源,其性信息素的总收率为 36-50%。该策略的关键步骤包括 CuI 催化的手性 2-甲基环氧乙烷氧化物的开环、仲甲苯磺酸盐的立体特异性转化以及醛与手性鏻盐的 Wittig 偶联。合成信息素将用于监测和控制这种害虫。
La présente invention concerne des prodrogues peptidiques, pouvant éventuellement porter au moins un principe actif sur la chaîne latérale de l'un des acides aminés constituant ladite prodrogue peptidique. Ces prodrogues peptidiques peuvent en outre être encapsulées afin d'améliorer, voire rendre possible, leurs activités biologiques ou pharmacologiques.
Peptide-Catalyzed Regio- and Enantioselective Reduction of α,β,γ,δ-Unsaturated Aldehydes
作者:Kengo Akagawa、Jun Sen、Kazuaki Kudo
DOI:10.1002/anie.201305004
日期:2013.10.25
in the title reaction. The inherent regioselectivity was overcome by the peptide catalyst to promote the 1,6‐selective reaction prior to 1,4‐reduction. High stereoconvergence was also achieved when using a mixture of geometric isomers of the starting aldehydes. Ach=1‐amino‐1‐cyclohexanecarboxylic acid.