Practical and highly stereoselective method for the preparation of several chiral arylsulfinamides and arylsulfinates based on the spontaneous crystallization of diastereomerically pure N-benzyl-N-(1-phenylethyl)-arylsulfinamides
作者:Rui-Heng Zhu、Xiao-Xin Shi
DOI:10.1016/j.tetasy.2011.01.028
日期:2011.2
A novel and simple process for the preparation of enantiomerically pure (S(s))-benzenesulfinamide (S(s))-3a, (S(s))-p-toluenesulfinamide (S(s))-3b, (S(s))-p-chloro-benzenesulfinamide (S(s))-3c and (S(s))-p-fluorobenzenesulfinamide (S(s))-3d has been developed. The treatment of arylsulfinyl chlorides with (R)-N-benzyl-1-phenylethanamine in the presence of excess triethylamine gave diastereomeric mixtures of N-benzyl-N-(1-phenylethyl)-arylsulfinamides 1, which underwent spontaneous crystallization to furnish diastereomerically pure (R,S(s))-N-benzyl-N-(1-phenylethyl)-arylsulfinamides (R,S(s))-1a-1d in 28%, 29%, 27% and 31% yields, respectively. The diastereomerically pure compounds (R,S(s))-1 were then converted into four enantiopure (R(s))-methyl arylsulfinates (R(s))-2, and finally into four enantiopure (S(s))-arylsulfinamides (S(s))-3 in good yields. (C) 2011 Elsevier Ltd. All rights reserved.