1,3-Dipolar cycloaddition reactions are one of the most important methods to obtain
diverse heterocycles with novel skeletons. We herein report the Brønsted 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 for further biological testing. Also, the protocol developed
achieved the formation of C–C and C–N bonds simultaneously in a single step.
Key words
cycloaddition - bicyclic N-heterocycles - azomethine imines -
N-benzyl azomethine ylide - TFA - Zn(OTf)
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