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. Author manuscript; available in PMC: 2012 Aug 19.
Published in final edited form as: Org Lett. 2011 Jul 25;13(16):4260–4263. doi: 10.1021/ol201608a

Figure 1.

Figure 1

(A) Schematic representation of the geometry and energy-minimized lowest energy transition structure for sulfinamide–urea/TfOH co-catalyzed Povarov reaction (from ref 5). (B) Schematic representation of the energy-minimized lowest energy ground state structure for the sulfinamide–urea 1a/TfOH ‘chiral acid’ complex. Structures calculated at the B3LYP/6-31G(d) level of density functional theory. Ar = 3,5-bis(CF3)C6H3.