Sythesis of 2-(2-Alkoxycarbonylphenylthio)-1,2-benzisothiazolin-3-ones from 2-Sulfenamoylbenzoates
摘要:
The mechanism of formation of 2-(2-alkoxycarbonylphenyl-thio)-1,2-benzisothiazolin-3-ones, which were obtained by the heating of 2-sulfenamoylbenzoates, was investigated. It appears that transamination occurred on the sulfur atom of a 2-sulfenamoylbenzoate between the amino group and the 1,2-benzisothiazolin-3-one, which formed by the cyclization of methyl 2-sulfenamoylbenzoate after heating, to give 2-(2-methoxycarbonylphenylthio)-1,2-benzisothiazolin-3-ones. Several types of 2-sulfenyl-1,2-benzisothiazolin-3-ones were synthesized from the 2-sulfenamoylbenzoates.
Various N-sulfenyl heterocycles were synthesized by transamination of sulfenamides using a chlorine gas-free method. The N-sulfenyl heterocycles behaved as sulfenylating reagents of anilines; N-sulfenylbenzimidazoles were the most effective. (c) 2005 Elsevier Ltd. All rights reserved.
Reactions of N-sulfenyl-1,2-benzisothiazolin-3-ones with nucleophiles
Reactions of N-[2-(alkoxycarbonyl)benzenesulfenyl]-1,2-benzisothiazolin-3-ones (1) with various nucleophiles were examined. Anions of active methylene compounds attacked the sulfur atoms of the suffenyl moieties of I to afford sulfide compounds, while thiols attacked the sulfur atoms of the benzisothiazolinone moieties of 1 to afford ring-opened products. Grignard reagents attacked both the above sulfur atoms to give ring-opened products along with sulfide compounds. (C) 2004 Published by Elsevier Ltd.