Abstract
Several 2-substituted sulfanyl benzo[
]thiazoles were regioselectively synthesized by the reaction of benzo[
]thiazole-2-thiol (
) with a variety of reagents under different basic conditions. Some 2-(2,3-disubstituted propyl sulfanyl)benzo[
]thiazoles were obtained from 2-(allylthio)benzo[
]thiazole, which was prepared by the allylation of
with allyl bromide in the presence of sodium hydride in dry
-dimethylformamide. Reaction of
with various pyrazolyl-quinoxaline derivatives was also investigated. Better yields and shorter reaction time were achieved for the synthesis of some derivatives by using ultrasound irradiation. The structural elucidation of all compounds was based on both analytical and spectroscopic data. The newly synthesized compounds were tested
for their antitumor activity against Ehrlich ascites carcinoma (EAC) cells grown in albino mice. Doxorubicin was used as a standard antitumor antibiotic, and some compounds showed half maximal inhibitory concentration (IC
) in the range 40–68 μg mL