Method of manufacturing vitamin D2, Vitamin D3, activated type v

Details Method of manufacturing vitamin D2, Vitamin D3, activated type v Method of manufacturing vitamin D2, Vitamin D3, activated type v

1992-04-24

1993-07-06

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

9,10-seco-cyclopentanohydrophenanthrene ring system or...

568817, 568822, 568828, 568838, C09J 900, C07C40100

Patent

active

052255794

ABSTRACT:
There is provided a method with which vitamin D.sub.2, vitamin D.sub.3, activated type vitamin D.sub.2, activated type vitamin D.sub.3 and their derivatives are prepared from 7,8 -dihyroxy vitamin D.sub.2, D.sub.3 or any of their derivatives by means of a reducing elimination technique involving as cyclic orthoester of a 7,8-dihydroxy compound or a thiocarbonate compound as an intermediate compound or an elimination technique utilizing a reducing metal such as titanium. The method according to the invention ensures a practical and simple synthetic process and a high yeild as compared with any existing methods for manufacturing these chemicals.

REFERENCES:
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