Sumitomo Chemical Company, Limited

István Barta

Taketo Hayashi

Hiroharu Kumazawa

Takehiko Kawakami

Junichi Nishikawa

Naruhito Masai

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.

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Paty, Hungary

István Barta