Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 67, Issue 15, Pages 5057-5067Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo020174u
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Catalysts comprising manganese-porphyrins carrying cyclodextrin binding groups are able to perform hydroxylations with substrate selectivity and regio- and stereoselectivity and high catalytic turnovers. The geometries of the catalyst/substrate complexes override intrinsic substrate reactivities, permitting attack on geometrically accessible saturated carbons of steroids in the presence of secondary carbinol groups and carbon-carbon double bonds, as in enzymatic reactions. Selective hydroxylations of steroid carbon 9 positions are of particular practical interest.
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