Ring Transformation of 3-Halo-1,2,4-triazines with a-Chlorocarbanions: A Novel Route to Pyrazoles with Sulfonyl, Sulfonamido and Sulfonyloxy Groups
摘要:
A novel route to pyrazoles bearing sulfonyl, sulfonamido and sulfonyloxy groups at C-3 by ring cleavage reaction of 3-halo-6-phenyl-1,2,4-triazines (1a-b) with alpha- halocarbanions (2a-g) is described.
Denitrogenative dismantling of heteroaromatics by nucleophilic substitution reactions with diazomethyl compounds
作者:Soumen Biswas、Claire Empel、Luis Mario Sanchez-Palestino、Hadi Arman、Rene M. Koenigs、Michael P. Doyle
DOI:10.1039/d4sc01578a
日期:——
Nucleophiles from deprotonation of diazomethyl compounds having diverse electron withdrawing groups react with 4-carboxylato-1,2,3-triazines at the 6-position to extrude dinitrogen and produce diazovinylketoesters compounds with five or six linear contiguous sp2-hybridized carbons, whereas these same nucleophiles react with 4-carboxylato-1,2,3-triazine 1-oxides, also at the 6-position, to form pyrazolines