## 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 [21-13C]-cholesterol
✍ Scribed by Gerardo M. Caballero; Eduardo G. Gros
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- French
- Weight
- 205 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0022-2135
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✦ Synopsis
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 spectroscopy.
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## 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. Locatio
## Abstract Cholesterol‐20‐^14^C was synthesized in four steps from pregnenolone‐20‐^14^C. The labelled intermediates were proven to be cholest‐5‐ene‐3β, 20α‐diol acetate‐3, cholesta‐5, 20 (22)‐diene‐3β‐ol acetate, and cholesterol acetate by ^1^H‐n.m.r. spectroscopical analysis. Cholesterol‐20‐^14^