Vitamin d3 derivative and production process thereof

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 401/00 (2006.01)

Patent

CA 2168728

A vitamin D, derivative represented by the following formula: (see formula I) wherein, R is, independently, a hydrogen atom, tri(C1 to C7 hydrocarbon) silyl group, C2 to C8 acyl group, or group forming an acetal bond together with an oxygen atom of a hydroxyl group, A is (see formula II) (see formula III) or (see formula IV) where, R1 is a methyl group or methylene group, and when R1 is a methylene group, the bond between the R1 and the 3-position of the lactone ring is a double bond, R2 is a hydrogen atom or C1 to C3 alkyl group, R3 is a hydrogen atom, or R2 and R3 together indicate a substitutable single methylene group.

Dérivé de la vitamine D3 représenté par la formule générale (I), dans laquelle les R représentent chacun indépendamment hydrogène, tri(hydrocarbyle C1-C7)silyle, acyle C2-C8 ou un groupe formant une liaison acétal avec l'atome d'oxygène ou un groupe hydroxyle; A représente les groupes (a), (b) ou (c); R<1> représente méthyle ou méthylène, à condition que lorsque R<1> est méthylène, la liaison entre ce composé et la position 3 du noyau lactone soit une double liaison; R<2> représente hydrogène ou alkyle C1-C3; et R<3> représente hydrogène, ou R<2> et R<3> peuvent se combiner pour représenter un groupe méthylène éventuellement substitué.

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