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The asymmetric hydrogenation of the prochiral heterocyclic ketone 2 and its O-protected analogues 9 to 11 in the presence of the ruthenium POX catalyst RuCl 2 (PPh 3 )(Ph 2 P-Fc-oxa i Pr) was studied. The reactivity of the substrate and the enantioselectivity of the reduction depended on the nature of the protecting group. The best results were achieved with the thexyldimethylsilyl...
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