Synthesis of a C-24-epimeric mixture of 25-hydroxy-[26,27-3H]vitamin D2 and a C-24-epimeric mixture of 1,25-dihydroxy-[26,27-'HIvitamin D2 by the Grignard reaction of the corresponding 25-keto-27-nor-vitamin D2 and lo-acetoxy-25keto-27-nor-vitamin D3 with tritiated methyl magnesium bromide is descri
Synthesis of 25-hydroxy[23,24-3H]vitamin D3
✍ Scribed by S. Yamada; H.K. Schnoes; H.F. DeLuca
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- English
- Weight
- 534 KB
- Volume
- 85
- Category
- Article
- ISSN
- 0003-2697
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✦ Synopsis
A synthesis of 25hydroxy [23,24JH]vitamin D3 leading to a radiochemically pure product with a specific activity of 78 Wmmol is described. The structure of the product was confirmed by comparison with unlabeled material and its biological activity was established by in vitro conversion to la,25dihydroxy[23,24-SH]vitamin D, using the chick kidney la-hydroxylase system.
📜 SIMILAR VOLUMES
A synthesis of radiochemically pure 25-hydroxy[26,27-3H]vitamin D, with a specific activity of 160 Wmmol is reported. The structure and biological activity of the radiolabeled compound was verified by comigration on high-pressure liquid chromatography with synthetic 2Shydroxyvitamin D, to constant s
## Abstract Natural (—)‐menthol (4) was oxidized to the lactone 9 which was alkylated with allyl bromide to a single product 10. The latter compound was transformed into bromo epoxide 33 which was cyclized with the highly reactive copper to the desired ring D Building block 18 of (24__S__)‐24‐hydro
## Abstract 25‐Hydroxycholesterin (**4**) ist in 30proz. Ausbeute in sieben Schritten aus Stigmasterin (**6**) hergestellt worden. Der wichtigste Schritt ist die Umsetzung des Tosylats **11** mit dem Acetylenderivat **13** zu **14** unter Bildung des vollständigen Cholesteringerüsts.
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