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Communication | Regular issue | Vol 22, No. 7, 1984, pp.1531-1535
Published online, 1st January, 1970
DOI: 10.3987/R-1984-07-1531
A Convenient Synthesis of Novel 3-Quinoxalinyl-1,5-benzodiazepines. Stable Tautomers in 1,5-Benzodiazepin-2-one Ring System

Yoshihisa Kurasawa,* Jun Satoh, Mie Ogura, Yoshihisa Okamoto, and Atsushi Takada

*School of Pharmaceutical Sciences, Kitasato University, Shirokane, Minato-ku, Tokyo 108-8641, Japan


Various 3-quinoxalinyl-1,5-benzodiazepines (3,4,6,7) were prepared via the ring transformation of 3-(N,N-dimethyl-carbamoyl)furo[2,3-b]quinoxaline hydrochloride (1). The hydrochlorides 3 and 7 are the tautomers of the N1,- or N5-H form and C3-H form, respectively, which are stable in solid and solution.