Sydnones as Masked Hydrazines for Heterocycle Formation: Reactions of 3-(2-substituted phenyl)sydnones with HCl
作者:Christopher R. Gelvin、Kenneth Turnbull
DOI:10.1002/hlca.19920750619
日期:1992.10.2
general, reaction of 3-(2-substituted phenyl)sydnones with HCl gives products derived from cleavage of the sydnone ring to the corresponding hydrazine and subsequent cyclization to the side chain. In one case, 3-(2-aminophenyl)sydnone (43), the product obtained, l-amino-lH-benzimidazole (47), apparently results from nucleophilic interception by the side chain prior to complete cleavage of the sydnone ring
Debromination of 3-Aryl-4-bromosydnones with Sodium Borohydride
作者:Kenneth Turnbull
DOI:10.1055/s-1986-31606
日期:——
Debromination of 4-bromo-3-(2-substituted aryl) sydnones 1 with sodium borohydride in methanol occurs readily to give good yields of the corresponding parent sydnones 2, except in those cases where the aryl substituent also reacts. The utility of the process for both sydnone purification and the preparation of novel sydnones has been examined briefly.