The reaction of 2,6-disubstituted-1-bromoaryl imines with sodium borohydride under reflux condition leads to an intramolecular cyclization through C–Br and C–H coupling without any transition-metal catalyst, furnishing 5,6-dihydrophenanthridine and phenanthridine derivatives.
W. Marcus Lambert, Stephanie Felten, Nicholas Hadler, N. Ian Rinehart, Rafal Swiatowiec, Gregory Storer, Jeremy Henle, Mark A. Servos, Cassie Yang, Anna V. Bay, Pascal N. Eyimegwu, Shashank Shekhar, John F Hartwig
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