Selective reductions of steroid carbonyl groups with homogeneous catalysts containing iridium and rhodium

Abstract
Steroid 2-, 3-, and 17-ketones can be reduced selectively with isopropyl alcohol, trimethyl phosphite, and sodium chloroiridate or tris(triphenylphosphine)-rhodium(I) chloride; stereospecific 2- and 3-reduction to the axial alcohol is best attained with the rhodium catalyst.

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