作者:Yeong-Jiunn Jang、Wen-Wei Lin、Yuh-Kuo Shih、Ju-Tsung Liu、Ming-Hsing Hwang、Ching-Fa Yao
DOI:10.1016/s0040-4020(03)00754-3
日期:2003.6
The reactions of ketones 1a-o, nitromethane 2, and a stoichiometric amount of piperidine 3a or ethylenediamine 3b in the presence of mercaptan 6a in THF or CH3CN solution give high yields of beta-nitrosulfides 7a-o. The latter can be oxidized by 8a (m-CPBA or m-CPBA/AcOH) at 0degreesC, 8b (H2O2/AcOH), or 8c (H2O2) at room temperature, thus generating beta-nitroalkylsulfoxides 9a-o, which then undergo elimination to produce medium to high yields of 2,2-disubstituted-1-nitroalkenes 5a-o, when refluxed in a solution of ClCH2CH2Cl (1,2-dichloroethane). After preparation from 1a-o, 2, 3, and 6a, 7a-o were oxidized with 8a, 8b, or 8c in a mixture of CH3CN and ClCH2CH2Cl to generate beta-nitrosulfoxides 9a-o, which then underwent elimination under refluxing under one-pot conditions. Compounds 14 and 15g were also prepared using 13, 2, 3b, and 6, in a similar manner. (C) 2003 Elsevier Science Ltd. All rights reserved.