Method of controlling the epimeric distribution in the preparati

Details Method of controlling the epimeric distribution in the preparati Method of controlling the epimeric distribution in the preparati

1987-09-11

1990-05-15

Hearn, Brian E.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07J 1700

Patent

active

049259334

ABSTRACT:
A method of controlling the epimeric distribution in the preparation of 16,17-acetals of pregnane derivatives characterized in reaction of a corresponding 16,17-acetonide with an aldehyde or ketone in (a) hydrocarbon solvent wherein the solubility of the pregnane derivative is less than 1 mg/l or in a halogenated hydrocarbon solvent together with a hydrohalogen acid or an organic sulphonic acid as catalyst and in the presence of small grains of an insert material in the reaction medium or (b) a halogenated hydrocarbon solvent together with a hydrohalogen acid an organic sulphonic acid as catalyst and in the presence of an epimeric distribution modifier.

REFERENCES:
patent: 3928326 (1975-12-01), Brattsand et al.
patent: 3929768 (1975-12-01), Brattsand et al.
CA, vol. 100, 1984, 36922z, "Deasphalting of Hydrocarbon Oil with Solvent".

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