Preparation of an A-ring building block for the total synthesis of 1α,25-dihydroxy vitamin D 3 and structurally related congeners: lipase-catalyzed stereoselective esterification of a suitable epoxyalcohol
An useful A-ring building block for the total synthesis of vitamin D3 congeners, compound 7, has been prepared starting from vitamin D2 by a chemo-enzymatic approach that relies on lipase-catalyzed acylation in an organic solvent for the stereoselective step.
Chemical conversion of vitamin D3 to its 1,35-dihydroxy metabolite
作者:Jaroslaw Kiegiel、Peter M. Wovkulich、Milan R. Uskoković
DOI:10.1016/0040-4039(91)80752-r
日期:1991.10
Vitamin D3 (6) has been converted to the 1,25-dihydroxy vitamin D3 metabolite (1) and the 1-alpha-fluoro derivative 2 via a new process. The strategy involved the cleavage of the ring A portion from the CD portion in vitamin D3 followed by the individual modification of each subunit ot form 3, 4, and 5. The subsequent recombination of 3 and 5 formed 1 while 4 and 5 produced 2.