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:
Aug. 30, 2005
Filed:
Apr. 03, 2002
Naruhito Masai, Osaka, JP;
Taketo Hayashi, Osaka, JP;
Hiroharu Kumazawa, Osaka, JP;
Junichi Nishikawa, Osaka, JP;
István Barta, Paty, HU;
Takehiko Kawakami, Osaka, JP;
Naruhito Masai, Osaka, JP;
Taketo Hayashi, Osaka, JP;
Hiroharu Kumazawa, Osaka, JP;
Junichi Nishikawa, Osaka, JP;
István Barta, Paty, HU;
Takehiko Kawakami, Osaka, JP;
Sumitomo Chemical Company, Limited, Osaka, JP;
Abstract
A process for conveniently and efficiently preparing a 2,6-dihalogenopurine using an inexpensive starting material. A process for preparing a 2,6-dihalogenopurine, comprising treating a 2-amino-6-halogenopurine having a protective group at 7position or 9position with a diazotizating agent and a halogen source; and a process for preparing a 9-acyl-2-amino-6-halogenopurine, comprising treating a 2-amino-6-halogenopurine with an acylating agent in the presence of a base.