High Performance of a Chiral Diene−Rhodium Catalyst for the Asymmetric 1,4-Addition of Arylboroxines to α,β-Unsaturated Ketones

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Abstract

[reaction: see text] A rhodium complex coordinated with (S,S)-2,5-dibenzylbicyclo[2.2.2]octa-2,5-diene (Bn-bod) showed high catalytic activity and high enantioselectivity in the asymmetric 1,4-addition of arylboroxines to cyclic alpha,beta-unsaturated ketones, 0.005-0.01 mol % of the catalyst giving high yields of the addition products with not lower than 94% ee. The turnover frequency of the catalyst is up to 1.4 x 10(4) h(-1).

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