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■ A Practical Synthesis of Novel Rho-Kinase Inhibitor, (S)-4-Fluoro-5-(2-methyl-1,4-diazepan-1-ylsulfonyl)isoquinoline

Noriaki Gomi, Tadaaki Ohgiya, Kimiyuki Shibuya,* Jyunji Katsuyama, Masayuki Masumoto, and Hitoshi Sakai

*Pharmaceutical Division, Tokyo New Drug Research Laboratories, Kowa Co., Ltd., 2-17-43, Noguchicho, Higashimurayama, Tokyo 189-0022, Japan

Abstract

A practical synthesis of novel Rho-kinase inhibitor, (S)-4-fluoro-5-(2-methyl-1,4-diazepan-1-ylsulfonyl)isoquinoline hydrochloride dihydrate (1) was achieved in a pilot-scale production. We have demonstrated the regioselective chlorosulfonylation of 4-fluoroisoquinoline in an one-pot reaction to afford 4-fluoroisoquinoline-5-sulfonyl chloride and the asymmetric construction of the (S)-2-methyl-1,4-diazepane moiety as key steps.