An efficient stereoselective synthesis of six stereoisomers of 3, 4-diaminocyclohexane carboxamide as key intermediates for the synthesis of factor Xa inhibitors
作者:Xin Wang、Mingliang Ma、Alavala Gopi Krishna Reddy、Wenhao Hu
DOI:10.1016/j.tet.2017.01.021
日期:2017.3
An efficient stereoselective route for the preparation of six stereoisomers of tert-butyl ((1R, 2S, 5S)-2-amino-5-(dimethylcarbamoyl)cyclohexyl)carbamate 1 starting from simple 3-cyclohexene-1-carboxylic acid has been described. Stereochemistry of the title compounds was controlled at C2 center by Mitsunobu reaction and at C5 via a base-catalyzed epimerization. Only a limited usage of column chromatography
为叔丁基六个立体异构体在制备一种有效的立体选择性路线((1 - [R,2小号,5小号)-2-氨基-5-(二甲基氨基甲)环己基)氨基甲酸叔丁酯1从简单的3-环己烯-1-羧酸开始已经描述过了。通过Mitsunobu反应将标题化合物的立体化学控制在C2中心,并通过碱催化的差向异构化控制在C5。柱色谱的有限使用为六个立体异构体提供了直接且可扩展的途径。