Cascade cyclization, dipolar cycloaddition of azomethine imines for the synthesis of pyrazolidines
作者:Hélène D. S. Guerrand、Harry Adams、Iain Coldham
DOI:10.1039/c1ob06122d
日期:——
one-pot reaction of aldehydes with hydrazines has been used for the preparation of tetrahydropyrazoles and dihydropyrazoles. The chemistry involves condensation then cyclization, followed by inter- or intramolecular dipolar cycloaddition of the resulting azomethine imine intermediates. The intramolecular cycloaddition gives fused tricyclic compounds as single diastereoisomers. The intermolecular cycloaddition