Vincze I, Lökös M, Bakos T, Dancsi A, Mák M. Steroids 49. Investigations on the dehydration of 17 alpha-ethynyl-17 beta-hydroxysteroids.
Steroids 1993;
58:220-4. [PMID:
8356574 DOI:
10.1016/0039-128x(93)90022-f]
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Abstract
The acidic dehydration of 17 alpha-ethynyl-17 beta-hydroxysteroids (1-3) was investigated. On reaction with thionyl chloride, phosphorus oxychloride, and formic acid, the desired dehydration was accompanied by chlorination, Wagner-Meerwein rearrangement, and D-homoaromatic rearrangement. The structure of the product from the transformation of 17 beta-hydroxypregn-20-yne derivative (3) on reaction with formic acid was misjudged. It was regarded as a pregn-16-en-20-yne (10) instead of the actually rearranged D-homoaromatic compound (11). As a consequence, physical data corresponding to this latter structure have been cited in the literature as those of pregn-16-en-20-yne derivative (10). This confusion prompted us to prepare compounds of both types (4, 9, 10, and 11), the characterization of which is here described.
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