Vicarious nucleophilic substitution of hydrogen vs. ANRORC-type ring transformation in reactions of 1,2,4-triazines with alpha-halocarbanions. Novel route to functionalized pyrazoles

Abstract

A novel route to pyrazole derivatives bearing sulfonyl, aminosulfonyl, alkoxy- and aryloxysulfonyl groups at C-3 by ring transformation of 3-chloro-6-aryl-1,2,4-triazines 1a-c with alpha-halocarbanions 2a-h is described