## Abstract For Abstract see ChemInform Abstract in Full Text.
Synthesis of [25R]- and [25S]-25,26-dihydroxyvitamin D3
โ Scribed by Naoyuki Koizumi; Masuo Morisaki; Nobuo Ikekawa
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- French
- Weight
- 226 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
โฆ Synopsis
In addition to the la-hydroxy group essential for eliciting biological activity, vitamin D3 metabolites bear the hydroxyl function in side chain at C-24, C-25 and/or C-26.2 Among those, the absolute configuration at C-24 in the 24-hydroxylated metabolites, 24,25_dihydroxyvitamin D33 and 1,24,25_trihydroxy-
๐ SIMILAR VOLUMES
25l?)-25,26-Dihydroxy-23-oxovitamin D3 was synthesized efficiently and stereoselectively, and it was converted enzymatically to (25R\_)-lcr,25,26-trihydroxy-23-oxovitamin D3, a putative metabolite of la,25\_dihydroxyvitamin D3. The spectral and chemical properties of (25R&25,26-dihydroxy-23-oxovitam
Two new fluorinated 25-hydroxyvitamin D3 analogs, 26,26,26-trifluoro-25-hydroxy (2) and 27-nor-26,26,26-trifluoro-25-hydroxyvitamin D3 (i), were prepared from 24-phenylsulfonyl 25,26,27-triorcholest-5-en-3B-yl tetrahydropyranyl ether (A). It is well known that vitamin D3 must be sequentially hydroxy
To determine the possibility that methyl substitution in 26- and 27-positions of 24R,25-dihydroxyvitamin D3 [24,25(OH)2D3] alters activities of the original compound, the effects of 24,25(OH)2D3 on calcium (Ca) regulating activity were compared with those of its methyl analog [24,25(OH)2(CH3)2D3] in