Site-specific labeling of indole derivatives; 3-(dimethylaminomethyl) indole-2-2H (1)
✍ Scribed by T. R. Bosin; R. B. Rogers
- Publisher
- John Wiley and Sons
- Year
- 1974
- Tongue
- French
- Weight
- 175 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0022-2135
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✦ Synopsis
Abstract
A procedure for the site‐specific labeling of indole derivatives has been developed. The procedure utilizes the blocking and activating properties of the p‐toluenesulfonyl group which allows for the facile metalation at the 2‐position of indole with n ‐butyllithium and incorporation of deuterium upon reaction with ^2^H~2~O. Removal of the p‐toluenesulfonyl group is achieved by treatment with sodium in liquid ammonia and occurs with retention of the label.
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## Abstract Heating of 1′‐(__N__‐substituted carbamoyl)methylspiro[2__H__‐1‐benzopyran‐2,2′‐[2__H__]indoles] with potassium hydroxide in ethanol yields diastereomeric 5a,13‐methano‐6__H__‐1,3‐benzoxazepino[3,2‐__a__]indole‐12‐carbox‐amides. Reduction of the latter with sodium borohydride affords 1,
Scheme 1. Gold(I)-catalyzed annulations of allenylindoles 1. Scheme 2. Cycloisomerization via 6-endo allene hydroarylation giving isolable pyridoA C H T U N G T R E N N U N G [1,2-a]-1H-indole derivatives.
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