Brønsted Acid or Lewis Acid Catalyzed [3+3] Cycloaddition of Azomethine Imines with N-Benzyl Azomethine Ylide: A Facile Access to Bicyclic N-Heterocycles
作者:Jia Liu、Risong Na、Shuo-ning Li、Bin Yu、Hong-lian Li
DOI:10.1055/s-0035-1560506
日期:——
1,3-Dipolarcycloaddition reactions are one of the most important methods to obtain diverse heterocycles with novel skeletons. We herein report the Bronsted acid or Lewis acid catalyzed [3+3] cycloaddition of azomethine imines with nonstabilized azomethine ylide generated in situ from an N-benzyl precursor, providing a clean and facile access to diverse bicyclic N-heterocycles in moderate to good yields
A convenient, simple, and expeditious procedure for the preparation of novel trifluoromethylated bicyclic pyrazolidinone systems by noncatalytic 1,3-dipolar cyclization of azomethine imines with tert-butyl 2-(trifluoromethyl)prop-2-enoate is presented.