Method of preparing vitamin d _and vitamin d _or activated...

Details Method of preparing vitamin d _and vitamin d _or activated... Method of preparing vitamin d _and vitamin d _or activated...

C - Chemistry, Metallurgy

07

C

260/491, 260/447

C07C 401/00 (2006.01) C07F 7/18 (2006.01)

Patent

CA 1338591

There is provided a method with which vitamin D2, vitamin D3, activated type vitamin D2, activated type vitamin D3 and their derivatives are prepared from 7, 8- dihyroxy vitamin D2, D3 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.

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