Ergosta-1,5,7,22-tetraen-3.beta.-ol and its use as an intermedia

Details Ergosta-1,5,7,22-tetraen-3.beta.-ol and its use as an intermedia Ergosta-1,5,7,22-tetraen-3.beta.-ol and its use as an intermedia

1987-11-04

1988-07-19

Schenkman, Leonard

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07J 900

Patent

active

047583835

ABSTRACT:
New processes for preparing new steroid derivatives including ergosta-1,5,7,22-tetraen-3.beta.-ol, 1.alpha.-hydroxyergosteryl diacetate, etc. which are useful intermediates in the synthesis of 1.alpha.-hydroxy vitamin D.sub.2. The processes include the new steps of reacting ergosta-1,4,6,22-tetraen-3-one with isopropenyl acetate in the presence of an acid catalyst followed by reduction to ergosta-1,5,7,22-tetraen-3.beta.-ol. The overall yield leading to 1.alpha.-hydroxy vitamin D.sub.2 is dramatically increased.

REFERENCES:
Chemical Abstracts; vol. 87 (1977) #118003c; Brynjolffssen et al.

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