Formation of 1-bromocarbonylindazoles via cleavage of 4-bromo ortho-substituted arylsydnones with HBr
作者:Jeffrey A. Marx、Kenneth Turnbull
DOI:10.1016/s0040-4039(00)60556-7
日期:1993.1
Treatment of 4-bromo-3-arylsydnones containing an ortho-carbonyl substituent (cf. 1d-j) with HBr gas leads to the corresponding, novel 1-bromocarbonyl-3-substituted indazoles (2d-k), generally in excellent yield.
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.