Shilpa C. Mhadgut and Bela Torok. University of Massachusetts, Boston, MA
A highly effective asymmetric heterogeneous catalytic hydrogenation of isophorone (3,5,5-trimethyl-2-cyclohexenone) by proline-modified base-supported Pd catalysts is described. Effective combination of enhanced proline adsorption and secondary kinetic resolution resulted in very high enantioselectivities (ee up to 99%). Using (S)-, and (R)-proline enantiomers as chiral auxiliaries, respectively, both enantiomers of the product were obtained with excellent optical yields.
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