Chemoselective Reduction of α-Cyano Carbonyl Compounds: Application to the Preparation of Heterocycles
作者:Scott R. Pollack、Jeffrey T. Kuethe
DOI:10.1021/acs.orglett.6b03285
日期:2016.12.16
in synthesis. General methods for their preparation typically afford α and β disubstitution patterns or β only. Molecules with only α-substituents (β-hydrogen) are much less well-known. A chemoselective reductive tautomerization of α-cyanoacetates, using DIBAL-H, has been developed to access these valuable synthons. α,β-Unsaturated cyanoacetates and α-cyanoketones can, also, be selectively reduced via
β-氨基丙烯酸酯是反应性中间体,是合成中有用的组成部分。制备它们的通用方法通常仅提供α和β破坏模式或仅提供β。仅具有α-取代基(β-氢)的分子是众所周知的。已经开发出使用DIBAL-H进行α-氰基乙酸酯化学选择性还原互变异构的方法,以获取这些有价值的合成子。也可以通过该方法选择性地还原α,β-不饱和氰基乙酸酯和α-氰基酮。使用这些β-烯氨基羰基化合物制备了一系列杂环。