The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 21, 2000
Filed:
May. 11, 1999
Andrew David Batcho, North Caldwell, NJ (US);
Percy Sarwood Manchand, Montclair, NJ (US);
Milan Radoje Uskokovic, Upper Montclair, NJ (US);
Hoffmann-La Roche Inc., Nutley, NJ (US);
Syntex (U.S.A.), Palo Alto, CA (US);
Abstract
The invention relates to a process for the preparation of vitamin D.sub.3 compounds of formula I. ##STR1## Wherein A is a single or a double bond; B is a single, cis-double, trans double or a triple bond; R.sub.1 and R.sub.2 are independently hydrogen, a lower alkyl, e.g., a C.sub.1 -C.sub.4 alkyl; R.sub.3 and R.sub.4 are independently a lower alkyl, e.g., C.sub.1 -C.sub.4 alkyl, a hydroxyalkyl, and a haloalkyl, e.g., a fluoroalkyl; and X and Y are independently hydrogen or hydroxy in the case when B is a single or a double bond.