N , N -1,2-Benzenedisulfonylimide, a new cyclic leaving group for the stereoselective nucleophilic substitution of amines
作者:Karsten Sørbye、Christoffer Tautermann、Per Carlsen、Anne Fiksdahl
DOI:10.1016/s0957-4166(98)00033-0
日期:1998.2
We hereby report the preparation and nucleophilic substitutions of the N,N-1,2-benzenedisulfonylimide derivatives la and 2a of the chiral amines 1 and 2. The nucleophilic attack of KNO2 afforded the respective alcohols 3 and 4 with 84-90% inversion of configuration. Nucleophilic attack by the azide ion afforded the azide products 5 and 6 which were reduced to the corresponding inverted amines 1 and 2 (94-98.5% inversion). The improved leaving group ability of the N,N-1,2-benzenedisulfonylimides compared with previously reported N,N-disulfonylimides is discussed. Chiral GLC analysis of all products is summarized and the alternative chiral analysis of product 3 by C-13 NMR using heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin as a chiral solvating agent (CSA) is discussed. (C) 1998 Elsevier Science Ltd. All rights reserved.