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:
Jun. 29, 1993
Filed:
Dec. 17, 1991
Tibor Timar, Tiszavasvari, HU;
Tibor Eszenyi, Tiszavasvari, HU;
Peter Sebok, Tiszavasvari, HU;
Vilmos Galamb, Tiszavasvari, HU;
Julia Fazekas, Tiszavasvari, HU;
Terezia Istvan, Tiszavasvari, HU;
Eva Kovach, Tiszavasvari, HU;
Erika Nagy, Tiszalok, HU;
Alkaloida Vegyeszeti Gyar, Tiszavasvari, HU;
Abstract
A process is disclosed for the preparation of (.+-.)-6-cyano-3,4-dihydro-2,2-dimethyl-trans-4-(2-oxo-1-pyrrol idino)-2H-1-benzopyran-3-ol of the Formula (VI) ##STR1## from 4-cyanophenol of the Formula (I) ##STR2## which comprises reacting 4-cyanophenol of the Formula (I) with isoprene, followed with bromination and dehydrobromination steps with formation of intermediates to react with 2-pyrrolidone resulting in obtaining the compound of the Formula (VI).