Last Updated: May 11, 2026

Claims for Patent: 8,410,103

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Summary for Patent: 8,410,103

Title:	(3S,11aR)-N-[2,4-difluorophenyl)methyl]-6-hydroxy-3-methyl-5,7-dioxo-2,3,5,7,11,11a-hexahydro[1,3]oxazolo[3,2-a]pyrido[1,2-d]pyrazine-8-carboxamide useful as anti-HIV agent
Abstract:	The present invention is directed to a substituted 2,3,5,7,11,11a-hexahydro[1,3]oxazolo[3,2 -a]pyrido[1,2-d]pyrazine-5,7-dione useful as an anti-HIV agent, which has the formula: as well as pharmaceutically acceptable salts thereof, compostions thereof, and methods of use thereof.
Inventor(s):	Brian Alvin Johns, Takashi Kawasuji, Teruhiko Taishi, Yoshiyuki Taoda
Assignee:	Shionogi and Co Ltd , ViiV Healthcare Co
Application Number:	US13/352,686
Patent Claims:	1. A compound which is (3S,11aR)—N-[(2,4-Difluorophenyl)methyl]-6-hydroxy-3-methyl-5,7-dioxo-2,3,5,7,11,11a-hexahydro[1,3]oxazolo[3,2-a]pyrido[1,2-d]pyrazine-8-carboxamide or a pharmaceutically acceptable salt thereof. 2. A pharmaceutical composition comprising (3S,11aR)—N-[(2,4-Difluorophenyl)methyl]-6-hydroxy-3-methyl-5,7-dioxo-2,3,5,7,11,11a-hexahydro[1,3]oxazolo[3,2-a]pyrido[1,2-d]pyrazine-8-carboxamide or a pharmaceutically acceptable salt thereof together with a pharmaceutically acceptable carrier or diluent. 3. A method of treatment of an HIV infection in a human comprising administering to said human an antiviral effective amount of (3S,11aR)—N-[(2,4-Difluorophenyl)methyl]-6-hydroxy-3-methyl-5,7-dioxo-2,3,5,7,11,11a-hexahydro[1,3]oxazolo[3,2-a]pyrido[1,2-d]pyrazine-8-carboxamide or a pharmaceutically acceptable salt thereof. 4. A compound which is (3S,11aR)—N-[(2,4-Difluorophenyl)methyl]-6-hydroxy-3-methyl-5,7-dioxo-2,3,5,7,11,11a-hexahydro[1,3]oxazolo[3,2-a]pyrido[1,2-d]pyrazine-8-carboxamide sodium salt. 5. A pharmaceutical composition comprising (3S,11aR)—N-[(2,4-Difluorophenyl)methyl]-6-hydroxy-3-methyl-5,7-dioxo-2,3,5,7,11,11a-hexahydro[1,3]oxazolo[3,2-a]pyrido[1,2-d]pyrazine-8-carboxamide sodium salt together with a pharmaceutically acceptable carrier or diluent. 6. A method of treatment of an HIV infection in a human comprising administering to said human an antiviral effective amount of (3S,11aR)-N-[(2,4-Difluorophenyl)methyl]-6-hydroxy-3-methyl-5,7-dioxo-2,3,5,7,11,11a-hexahydro[1,3]oxazolo[3,2-a]pyrido[1,2-d]pyrazine-8-carboxamide sodium salt. 7. A compound of the formula:

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