M. Biollaz, W. Haefliger, E. Velarde, P. Crabbé, J. Fried
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A two-step synthesis of the pregnane and corticoid side-chains
Zinc converts the 17α-ethynyl carbinol acetate (1) by a reductive process accompanied by rearrangement and elimination, into the allenyl steroid (2a), a useful intermediate for the preparation of the corticoid chain by osmylation, and of 17α-hydroxy-20-oxo-pregnanes by peracid oxidation.
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