Synthesis of [carbonyl-14C]sparfloxacin.
A new antimicrobial quinolone, sparfloxacin (5-amino-1-cyclopropyl-7- (cis-3,5-dimethyl-1-piperazinyl)-6,8-difluoro-1,4-dihydro-4-oxoquinoline -3- carboxylic acid, AT-4140; CAS 110871-86-8), was labeled by 14C for studies of disposition and metabolism. Ethyl pentafluoro[carbonyl-14C]benzoylacetate (I) was reacted with ethyl orthoformate, cyclopropylamine and then potassium tert-butoxide to give a quinolone intermediate (IV). A benzylamino derivative (V) obtained by condensation of IV and benzylamine was subject to catalytic hydrogenolysis and hydrolyzed to give the carboxyl derivative (VII), which was condensed with cis-2,6-dimethylpiperazine to form [carbonyl-14C]sparfloxacin. The average yield of 3 preparations was 41.5% and specific activities were 310.8-366.3 MBq (8.4-9.9 mCi)/mmol. Both chemical and radiochemical purities were greater than 99%.
Kagemoto
A
A
Research Laboratory, Dainippon Pharmaceutical Co., Ltd., Osaka, Japan.
Negoro
T
T
Nakao
M
M
Ochi
T
T
Chiba
K
K
Kataoka
M
M
Sekine
Y
Y
D002855:Chromatography, Thin Layer; D024841:Fluoroquinolones; D006868:Hydrolysis; D007202:Indicators and Reagents; D007553:Isotope Labeling; D015363:Quinolones / Q000138:chemical synthesis*
D024841:Fluoroquinolones; D007202:Indicators and Reagents; D015363:Quinolones; C061363:sparfloxacin