Method For Synthesizing Vitamin D Analogs
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United States of America Patent
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Issued Date -
May 24, 2012
app pub date -
Nov 25, 2009
filing date -
Nov 26, 2008
priority date (Note) -
Abandoned
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Abstract
Processes for preparing vitamin D2 derivatives and intermediates to vitamin D2 derivatives are disclosed. An improved photolysis process for the preparation of cis intermediate (I) from the trans starting material (II) are disclosed. Also disclosed is an improved process for the formation of a trans double bond at C22-C23 of the vitamin D2 derivative, which provides high selectivity of the desired trans double bond of compound (III) over the undesired cis double bond of compound (IIIA).
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