Process for the manufacture of pure isoquinoline derivatives

Details Process for the manufacture of pure isoquinoline derivatives Process for the manufacture of pure isoquinoline derivatives

1976-12-07

1978-11-21

Coughlan, Jr., Paul M.

Harness for working animal

546144, 260465F, 2605708R, C07D21720

Patent

active

041266153

ABSTRACT:
In the production of perparine or papaverine and their hydrochlorides, the formation of impurities in the reaction mixture is suppressed by fractionating a 3,4-di-R-benzyl-cyanide in the presence of an organic base (e.g. pyridine, dimethylformamide, ethylenediamine or triethylamine) followed by hydrogenation with a Raney-nickel catalyst treated with aqueous ammonium carbonate solution. R is methoxy or ethoxy.

REFERENCES:
patent: 3052682 (1962-09-01), Frommel

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