Formation of 1-bromocarbonylindazoles via cleavage of 4-bromo ortho-substituted arylsydnones with HBr
摘要:
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.
Rhodium-Catalyzed Regioselective C7-Olefination of Indazoles Using an N-Amide Directing Group
作者:Lei Guo、Yanyu Chen、Rong Zhang、Qiujun Peng、Lanting Xu、Xianhua Pan
DOI:10.1002/asia.201601456
日期:2017.2.1
A rhodium‐catalyzed regioselective C−H olefination of indazole is described. This protocol relies on the use of an efficient and removable N,N‐diisopropylcarbamoyl directinggroup, which offers facile access to C7‐olefinated indazoles with high regioselectivity, ample substrate scope and broad functional group tolerance.