Claims for Patent: 6,444,673

Summary for Patent: 6,444,673

Title:	Optically active 5H-pyrrolo[3,4-b]pyrazine derivative, its preparation and pharmaceutical compositions containing it
Abstract:	Dextrorotatory isomer of 6-(5-chloro-2-pyridyl)-5-[(4-methyl-1-piperazinyl)carbonyloxy]-7-oxo-6,7-d ihydro-5H-pyrrolo[3,4-b]pyrazine, its preparation and pharmaceutical compositions containing it which are usable as tranquillizers and hypnotics.
Inventor(s):	Cotrel; Claude (Paris, FR), Roussel; Gerard (Soisy sur Seine, FR)
Assignee:	Sepracor Inc. (Marlborough, MA)
Application Number:	09/722,438
Patent Claims:	1. 6-(5-chloro-2-pyridyl)-5-[(4-methyl-1-piperazinyl)carbonyloxy]-7-oxo-6,7-d ihydro-5H-pyrrolo[3,4-b]pyrazine, or a pharmaceutically acceptable salt thereof, in the form of its dextrorotatory isomer and essentially free of its levorotatory isomer. 2. A pharmaceutical composition comprising an effective amount of the dextrorotatory isomer, essentially free of the levorotatory isomer of 6-(5-chloro-2-pyridyl)-5-[(4-methyl-1-piperazinyl)-carbonyloxy]-7-oxo-6,7- dihydro-5H-pyrrolo[3,4-b]pyrazine, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier. 3. The compound according to claim 1, wherein the pharmaceutically acceptable salt is a salt of a mineral acid, or a substituted derivative thereof, selected from the group consisting of hydrochlorides, sulfates, nitrates, and phosphates. 4. The compound according to claim 1, wherein the pharmaceutically acceptable salt is a salt of an organic acid, or a substituted derivative thereof, selected from the group consisting of acetates, propionates, succinates, benzoates, fumarates, tartrates, theophyllineacetates, salicylates, and phenolphthalinates. 5. The pharmaceutical composition according to claim 2, wherein the pharmaceutically acceptable salt is a salt of a mineral acid, or a substituted derivative thereof, selected from the group consisting of hydrochlorides, sulfates, nitrates, and phosphates. 6. The pharmaceutical composition according to claim 2, wherein the pharmaceutically acceptable salt is a salt of an organic acid, or a substituted derivative thereof, selected from the group consisting of acetates, propionates, succinates, benzoates, fumarates, tartrates, theophyllineacetates, salicylates, and phenolphthalinates. 7. The pharmaceutical composition according to claim 2, wherein the therapeutically effective amount of 6-(5-chloro-2-pyridyl)-5-[(4-methyl-1-piperazinyl)-carbonyloxy]-7-oxo-6,7- dihydro-5H-pyrrolo[3,4-b]pyrazine, or a pharmaceutically acceptable salt thereof, is from about 2.5 mg to about 15 mg. 8. The pharmaceutically composition according to claim 2, wherein the pharmaceutically acceptable carrier comprises a diluent.