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D
IBAL-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。