Efficient Synthesis of Quaternary α-Hydroxy Acids by Alkylation of α-Ketoamide-Derived Dienediolates
作者:Stephen P. Marsden、Rebecca Newton
DOI:10.1055/s-2005-918481
日期:——
Double deprotonation of α-ketoamides generates dienediolates, which undergo regioselective α-alkylation to yield α-substituted-α-hydroxy-β,γ-unsaturated amides. 1,2-Disubstituted alkenes are generated exclusively as the E-isomer. 1,1-Disubstituted and 1,1,2-trisubstituted olefins can also be prepared. The amides can be readily converted to the corresponding acids.
α-酮酰胺的两次脱质子化生成二烯二醇盐,它们经历区域选择性的α-烷基化反应,生成α-取代-α-羟基-β,γ-不饱和酰胺。生成的1,2-二取代烯烃仅为E-异构体。1,1-二取代和1,1,2-三取代烯烃也可以制备。这些酰胺可以容易地转化为相应的酸。