Facile two-step synthesis of 3-substituted indazoles using diazo(trimethylsilyl)methylmagnesium bromide
作者:Yoshiyuki Hari、Ryosuke Sone、Toyohiko Aoyama
DOI:10.1039/b907796k
日期:——
Diazo(trimethylsilyl)methylmagnesium bromide readily reacted with various ketones and aldehydes to give the corresponding 2-diazo-(2-trimethylsilyl)ethanols. These were efficiently converted to indazoles bearing hydroxymethyl units at the 3-position by intermolecular [3 + 2] cycloaddition with benzynes.
A Novel Synthesis of 3-Substituted Indazole Derivatives
作者:Willard M. Welch、Catherine E. Hanau、William M. Whalen
DOI:10.1055/s-1992-26268
日期:——
The dianion prepared from 3-bromo-1H-indazole and alkyllithium bases reacts with a variety of electrophiles to give the corresponding 3-monosubstituted 1H-indazole derivatives in moderate yields. This procedure is more general and shorter than earlier methods.