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:
Jan. 26, 1993
Filed:
May. 10, 1990
Karl Schonafinger, Alzenau, DE;
Helen H Ong, Whippany, NJ (US);
Hoechst-Roussel Pharmaceuticals Incorporated, Somerville, NJ (US);
Abstract
There are disclosed novel compounds of the formula ##STR1## where X is hydrogen, loweralkyl, loweralkoxy, hydroxy, halogen, nitro or trifluoromethyl; R.sub.1 is hydrogen or loweralkyl; R.sub.2 is hydrogen, loweralkyl, arylloweralkyl or --(CH.sub.2).sub.m R.sub.7 wherein m is 1, 2 or 3 and R.sub.7 is cyano or amino; R.sub.3 and R.sub.4 are independently hydrogen or loweralkyl; R.sub.5 and R.sub.6 are independently hydrogen or loweralkyl, or R.sub.5 +R.sub.6 taken together with the carbon atom to which they are attached constitute a cyclobutane, cyclopentane, cyclohexane, cycloheptane, pyrrolidine, piperidine, morpholine or thiomorpholine ring, or R.sub.5 is hydrogen and R.sub.6 is aryl or --CH.sub.2 OR.sub.8 wherein R.sub.8 is hydrogen, loweralkyl or loweralkylcarbonyl, which are useful for enhancing memory.