Asymmetric Strecker Synthesis of the Four α-Quaternary 1-Amino-2-methylcyclohexanecarboxylic Acids
作者:Franz-Josef Volk、August Wilhelm Frahm
DOI:10.1002/jlac.199619961126
日期:1996.11
The synthesis of the four 1-amino-2-methylcyclohexanecarboxylic acids 13, 14, 15, and 16 from diastereomeric mixtures of the α-amino nitriles 1–4 by successive application of conc. H2SO4, Pd/C H2, and conc. HCl is described. The amino nitriles 1–4 were prepared by asymmetric Strecker synthesis under various reactions, The formation of 1–4 is thermodynamically controlled in protic solvents (e.g. MeOH)
通过连续应用浓硫酸,由α-氨基腈1-4的非对映异构体混合物合成四种1-氨基-2-甲基环己烷羧酸13、14、15和16。H 2 SO 4,Pd / CH 2和浓。描述了HCl。所述氨基腈1-4分别通过不对称Strecker合成下各种反应制备的形成1-4在质子溶剂是热力学控制的(例如甲醇),而反应是在非质子溶剂动力学控制(例如己烷)下, α–氨基酰胺5–8的分离,这是通过1–4的部分水解获得的通过CC,LPLC和HPLC实现。所有合成化合物的绝对构型仅通过两次具有连续相关性的X射线分析确定。讨论了不对称Strecker合成的空间控制。