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ChemInform Abstract: Synthesis and Isomerization of 19-Hydroxy-5β,19-cyclosteroids.

J. F. TEMPLETON,W. LIN,Y. LING,K. MARAT

Cheminform（2010）

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Abstract
Abstract Synthesis of 19(R/S)-hydroxy-5β,19-cycloandrostane-3,17-dione by reductive cyclization of the steroid 4-en-3-one 19-aldehyde with zinc in aqueous acetic acid is reported. On either acid or base treatment the R-isomer is converted to the S-isomer through an intermediate 3-hydroxy-3,5-cyclosteroid.
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Enzymatic Hydroxylation
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