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

1975-08-04

1977-10-25

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260327M, 26034861, 26034857, 260631R, 2603407, 260609R, 2603409AS, 260615R, 260397, 2604482R, 260526N, 260594, 260535R, 260601R, 260601H, 260602, 260586F, 260586M, 26034811, 26034858, 260609D, 560261, 560262, 560258, 560227, 560126, C07C 3506

Patent

active

040556034

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, usully 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.

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