Alkinyl terminating groups in biogenetic-like cyclizations to st

Details Alkinyl terminating groups in biogenetic-like cyclizations to st Alkinyl terminating groups in biogenetic-like cyclizations to st

1977-08-03

1980-02-19

Roberts, Elbert L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603407, 2603409AS, 26039745, 2603973, 2603974, 2603972, C07C 7100

Patent

active

041894316

ABSTRACT:
Polyenine compounds are provided having the naturally occurring geometry and a group which in the presence of acid initiates a carbocation cyclization to a steroid or A-nor-steroid structure, particularly the pregnane parent structure. The compounds are formed for the most part by condensation of two units prepared from readily available small molecules and are joined to form a polyenine, usually having a substituted carbocyclic ring which upon contact with a Lewis acid catalyst (includes protonic) cyclizes directly to provide the 5-membered D ring as well as substitution at the C-20 position.

REFERENCES:
patent: 3884945 (1975-05-01), Johnson et al.
patent: 4032579 (1977-06-01), Johnson

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