Asymmetric Hydrogenation of Cyclic Ketimines Catalyzed by Iridium(I)-Complexes of BCPM and Its Analog1

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Abstract
Modified pyrrolidinebisphosphines, BCPM (1a) and its analog MCCPM (1b), were found to be more efficient ligands than the original BPPM (2a) in the iridium(I)-catalyzed asymmetric hydrogenation of imines in the presence of iodide. In particular, the modified ligands (1a,b) showed very high enantioselectivity of up to 91% ee in the hydrogenation of 2,3,3-trimethylindolenine (6) in the presence of bismuth(III) iodide.

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