Synthesis of All the Diastereomers of 2-Amino-3-hydroxy-4,5-dimethylhexanoic Acid
作者:Jan Spengler、Fernando Albericio
DOI:10.1002/ejoc.201301257
日期:2014.1
Herein, we describe an efficient stereoselective synthesis of all the diastereomers of 2-amino-3-hydroxy-4,5-dimethylhexanoic acid. The γ-branched carbon skeleton was set up by reaction of Garner's aldehyde with 2-lithio-3-methyl-2-butene. Hydrogenation (Pd/C catalyst) of the tetrasubstituted olefin proceeded smoothly with acceptable stereoselectivity, depending on the diastereomer hydrogenated. The
在此,我们描述了 2-氨基-3-羟基-4,5-二甲基己酸的所有非对映异构体的有效立体选择性合成。γ-支链碳骨架是通过加纳醛与2-锂硫-3-甲基-2-丁烯反应建立的。取决于氢化的非对映异构体,四取代烯烃的氢化(Pd/C 催化剂)以可接受的立体选择性顺利进行。然后通过分子内环化、琼斯氧化和加纳醛的 5-7 步水解以 12-18% 的总产率获得最终化合物。