Synthesis of polycyclic amines was achieved by benzoic acid catalysed reaction of 1-aryl THIQs and 1-aryl trypolines with o-allyl salicylaldehydes through the in situ generated azomethine ylide intermediates that undergo intramolecular [3+2]-cycloadditions with four new stereogenic centers in excellent diastereoselectivities under simple and mild conditions.
C. S. Pavan Kumar, K. B. Harsha, N. C. Sandhya, A. B. Ramesha, K. Mantelingu and K. S. Rangappa, New J. Chem., 2015, 39, 8397 DOI: 10.1039/C5NJ01706H
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