Selective synthesis of bis[1,2]dithiolo[1,4]thiazines from 4-isopropylamino-5-chloro-1,2-dithiole-3-ones
作者:Lidia S. Konstantinova、Andrej A. Berezin、Kirill A. Lysov、Oleg A. Rakitin
DOI:10.1016/j.tetlet.2007.06.071
日期:2007.8
Reaction of 4-isopi-opylamiiio-5-chloro-1,2-dithiole-3-oiies 3 and S2Cl2 in acetonitrile gave selectively 3-oxo-bis[1,2]dithiolo[1,4]tliiazine-5-tiliones I by the addition of triethylamine and bis[1,2]dithiolo[1,4]thiazine-3,5-diones 5 under the action of formic acid. 3,5-Diones 5 were also obtained by intramolecular cyclization of N,N-bis(5-chloro-3-oxo[1,2]dithiol-4-yl)amines 6 with S,Cl, in the presence of Et3N. (c) 2007 Elsevier Ltd. All rights reserved.