Fig. 1
From: Enantioselective [3+3] atroposelective annulation catalyzed by N-heterocyclic carbenes
Representative molecules and synthetic protocols. a Two representative axially chiral molecules. b NHC-catalyzed transformations via the use of unsaturated acyl azolium intermediate. c Our synthetic proposal via [3+3] atroposelective annulation. NHCs react with ynals to generate chiral alkynyl acyl azolium intermediates to further react with cyclic 1,3-diones
