1, 3-Dipolar cycloadditions of silicon and tin alkynes and alkenes. Regiospecific synthesis of silyl and stannylpyrazoles and pyrazolines

AM González-Nogal, M Calle, P Cuadrado, R Valero

Index: Gonzalez-Nogal, Ana M.; Calle, Mariola; Cuadrado, Purificacion; Valero, Raquel Tetrahedron, 2007 , vol. 63, # 1 p. 224 - 231

Full Text: HTML

Citation Number: 22

Abstract

Silicon and tin 3-, 3, 5-, and 3, 4, 5-metalated pyrazoles have been synthesized by 1, 3- dipolar cycloadditions of silyl-, disilyl-, and silylstannylacetylenes with N-phenylsydnone or trimethylsilyldiazomethane. On the other hand, 1-and 2-pyrazolines monometalated and dimetalated in different positions of the heterocycle have been prepared by reaction of vinylsilanes and vinylstannanes with the same 1, 3-dipolar reagents. Other interesting ...