| abstract |
(57) [Summary] [Objective] To find a novel vitamin D 3 derivative that can be a bone formation promoter and a method for producing the same. [Constitution] The following formula (1) (In the formula, R 1 represents a hydrogen atom or a C1-C3 alkyl group, R 2 represents a hydrogen atom. Further, R 1 and R 2 may represent one methylene group which may be substituted with both. there .R 3 represents a hydrogen atom, tri (C1 to C7 hydrocarbon) silyl group, C2-C8 acyl group or a hydroxyl group which forms an acetal bond together with an oxygen atom.) A vitamin D 3 derivative represented by And its manufacturing intermediates. |