反应详情

A mixture of 1 part of 7-chloro-2,3-dihydro-3-oxo-5H-pyrido[3,4-b][1,4]benzothiazine-4-carbonitrile, 14 parts of ethaneperoxoic acid, and 58 parts of acetic acid is stirred at room temperature for 27 hours, whereupon insoluble solids are filtered out, dried in air, and recrystallized from aqueous N,N-dimethylformamide to give 7-chloro-2,3-dihydro-3-oxo-5H-pyrido[3,4-b][1,4]benzothiazine-4-carbonitrile 10-oxide as a colorless solid melting above 300°.

1. filtrationare filtered out
2. customdried in air
3. customrecrystallized from aqueous N,N-dimethylformamide