Synthesis of 2 H -1,4-benzothiazin-3(4 H )-ones and 2 H -1,4-benzoselenazin-3(4 H )-ones with the aid of samarium(II) iodide
作者:Weihui Zhong、Yongmin Zhang
DOI:10.1016/s0040-4039(01)00360-4
日期:2001.4
Bis(o-nitrophenyl) disulfides or diselenides were easy to reduce by samarium(II) iodide to produce the active intermediates 2 in situ, which readily react with alpha -halocarboxylic derivatives to yield the corresponding products 2H-1,4-benzothiazin-3(4H)-ones and 2H-1,4-benzoselenazin-3(4H)-ones, respectively, in moderate to high yields under mild conditions. (C) 2001 Elsevier Science Ltd. All rights reserved.
Conversion of bis(o-nitrophenyl)diselenides to heterocycles containing selenium and nitrogen with the aid of samarium diiodide
作者:Xiaoyuan Chen、Weihui Zhong、Yongmin Zhang
DOI:10.1002/hc.10034
日期:——
Treatment of bis(o-nitrophenyl)diselenides with SmI2 led to simultaneous reduction of nitro groups and reductive cleavage of SeSe bonds as well as to the formation of the intermediates 2. The intermediates 2 were “living” double-anions formed in situ, and reacted readily with ω-bromoketones and α-bromocarboxylic acid derivatives to afford the desired 2H-1,4-benzoselenazines and 2H-1,4-benzoselenazin-3(4H)-ones