Process for the preparation of 1.alpha.,25-dihydroxyvitamin D.sub.2 and the 24-epimer thereof
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United States of America Patent
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Feb 11, 1992
Grant Date -
N/A
app pub date -
Apr 4, 1989
filing date -
Apr 11, 1988
priority date (Note) -
Expired
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Abstract
(22E)-5,7,22-Ergostatriene-1.alpha.,3.beta.,25-triol and the 24-epimer thereof which are new intermediates for the synthesis of 1.alpha.,25-dihydroxyvitamin D.sub.2 and the 24-epimer thereof. A new process for the preparation of 1.alpha.,25-dihydroxyvitamin D.sub.2 and the 24-epimer thereof is also described which comprises irradiation of (22E)-5,7,22-ergostatriene-1.alpha.,3.beta.,25-triol or the 24-epimer thereof followed by isomerization.
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