Regioselective Synthesis of Silylated Pyrazolines and Indazolines by Reaction of Pyrazolium and Indazolium Salts with Silyllithium Reagents
作者:Ana M. González-Nogal、Mariola Calle、Luis A. Calvo、Purificación Cuadrado、Alfonso González-Ortega
DOI:10.1002/ejoc.200500438
日期:2005.11
Pyrazoliumsalts react with dimethylphenylsilyl- and tert-butyldiphenylsilyllithium to give, in general, only one of the two possible 5-silyl-3-pyrazolines. On the other hand, indazolium and isoindazolium salts lead to 3-silylindazolines and occasionally to compounds resulting from the opening or expansion of the heterocyclic ring. All of these compounds are interesting synthons in organic chemistry