The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 02, 1996
Filed:
Jul. 22, 1994
Roman Sobotik, Opava, CS;
Petr Bulej, Opava, CS;
Tomas Kolasin, Ostrava, CS;
Alexandr Jegorov, Ceske Budejovice, CS;
Petr Sedmera, Prague, CS;
Ales Husek, Opava, CS;
Anna Jurcakova, Opava, CS;
Galena a.s., Komarov, CZ;
Abstract
Process for the preparation of 3,14.beta.-dihydroxy-17-normorphinan ##STR1## A suitable economic process for the preparation of 3,14.beta.-dihydroxy-17-normorphinan of a general formula (I) is being solved, which is a key intermediate of a semisynthetic synthesis of an effective analgesic of Butorphanol from thebaine. Synthesis includes a two step N-demethylation, and concerted dephenoxylation of 4-phenoxy-14.beta.-hydroxy-3-methoxymorphinan in the first step by means of a chloroformate, then, in the second step, by means of sodium action in a liquid ammonia, and by means of the following O-demethylation under action of a complex of aluminium chloride - dialkylsulfide.