A Novel One-Pot Method for the Preparation of Pyrazoles by 1,3-Dipolar Cycloadditions of Diazo Compounds Generated in Situ
作者:Varinder K. Aggarwal、Javier de Vicente、Roger V. Bonnert
DOI:10.1021/jo0268409
日期:2003.6.1
procedure for the preparation of pyrazoles by 1,3-dipolar cycloaddition of diazocompounds generated in situ has been developed. Diazocompounds derived from aldehydes were reacted with terminal alkynes to furnish regioselectively 3,5-disubstituted pyrazoles. Furthermore, the reaction of N-vinylimidazole and diazocompounds derived from aldehydes gave exclusively 3-substituted pyrazoles in a one-pot process