Carbocyclic α-amino acids: asymmetric synthesis of all four 1-amino-2-hydroxycyclohexanecarboxylic acids
作者:Kamalesh Pai Fondekar、Franz-J Volk、August W Frahm
DOI:10.1016/s0957-4166(99)00045-2
日期:1999.2
respectively, the four stereoisomers of 1-amino-2-hydroxycyclohexanecarboxylic acid are obtained via an asymmetric Strecker synthesis with ee values ranging from 87 to 98%. Their stereochemistry is established by NMR methods and by X-ray analyses. Hydrogenolysis of a benzylic C–N bond by conc. sulphuric acid as well as cleavage of a methoxy ether by conc. HCl are two intriguing reactions which are observed
分别从外消旋的2-甲氧基环己酮和(S)-或(R)-1-苯基乙胺开始,通过不对称的Strecker合成获得了1-氨基-2-羟基环己烷羧酸的四种立体异构体,其ee值在87%到98%之间。 。它们的立体化学是通过NMR方法和X射线分析确定的。通过conc。进行苄基C–N键的氢解。硫酸和甲氧基醚的裂解 HCl是两个有趣的反应,可在本文所述的五步程序中观察到。