The behavior of 1,4-benzodiazepine drugs in acidic media. III. Carbon-13 nuclear magnetic resonance spectra of flutazolam in acidic aqueous solution.
作者:TOMONARI KUWAYAMA、TAMOTSU YASHIRO
DOI:10.1248/cpb.33.4528
日期:——
Structural changes of flutazolam in acidic aqueous solution were investigated by using proton and carbon-13 nuclear magnetic resonance spectroscopy. Flutazolam underwent a rapid cleavage of the oxazolidine ring to form an iminium compound, followed by slow hydrolysis of the iminium bond to give a benzophenone compound, like other 1, 4-benzodiazepinooxazoles. Neutralization of the flutazolam solution caused recycling, which was not found in the case of other compounds that had no substituent at the nitrogen atom in position 7. The carbon-13 resonances of these compounds and of the corresponding aminobenzophenone derivatives isolated under strongly acidic conditions were assigned.