## Abstract The synthesis of [20,21‐^13^C~2~]‐pregnenolone (7) from androst‐5‐en‐3β‐ol‐17‐one (1) is described. Labelled carbons were introduced by two procedures, namely, condensation of 1 with K^13^CN and Grignard reaction of nitrile derivative 5 with [^13^C]‐methylmagnesium iodide. Location of l
Synthesis of [20,21-13C2]-progesterone
✍ Scribed by Gerardo M. Caballero; Eduardo G. Gros
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- French
- Weight
- 263 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0022-2135
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✦ Synopsis
Abstract
The synthesis of, [20,21‐^13^C~2~]‐progesterone (9) from androst‐4‐ene‐3,17‐dione (1) is described. Labels were introduced by two procedures, namely, condensation of 1 with K^13^CN and Grignard reaction of nitrile derivative 7 with [^13^C]‐methylmagnesium iodide. Location of labels was confirmed by ^13^C‐NMR spectroscopy.
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## Abstract The synthesis of [21‐^13^C]‐cholesterol (5) from 3β‐O‐(t‐butyldimethylsilyl)‐17β‐cyano‐androst‐5‐ene (1) is described. Labelled carbon‐atom was introduced by Grignard reaction of nitrile derivative with [^13^C]‐methylmagnesium iodide. Location of label was confirmed by ^13^C‐NMR spectro
## Abstract [^13^C~2~]Nifedipine (3) was synthesized from [^13^C]methanol (&1macr;) in two steps. Copyright © 2003 John Wiley & Sons, Ltd.
## Abstract [2′‐^13^C]Biotin was synthesized in 51% yield by reaction of the hydrolysis product of biotin, 3,4‐diaminotetrahydro‐2‐thiophenvalerianic acid, with [^13^C]phosgene.