and chemicals utilized in the study were of analytical quality and
supplied by commercial providers. The chemicals used in this study
were sourced from various suppliers. 2-Aminobenzothiazole (Sigma-Aldrich,
99%), sulfapyridine (NENTECH, U.K., 99%), sulfaguanidine (Tokyo Chemical
Industry, Japan, 98%), piperazine (Central Dreug House, India, 99%),
benzylamine (Loba Chemi, India, 99%), cyclohexylamine (Sigma-Aldrich,
99%), 3,4 dimethylaniline (GCC, U.K., 98%), 4-chloroaniline (Sigma-Aldrich,
98%), 4-bromoaniline (Sigma-Aldrich, 90%), 4-fluoroaniline (Sigma-Aldrich,
99%), 4-nitroaniline (Janssen, Belgium, 98%), diethylamine (GCC, U.K.,
98%), m-toluidine (Sigma-Aldrich, 99%), morpholine
(Tokyo Chemical Industry, Japan, 99%), dimethylformamide (DMF) (Carlo
Erba, France, 99.9%), acetone (Carlo Erba, France, 99%), triethylamine
(TEA) (TEDIA, 99%), ethanol (Carlo Erba, France, 98%), n-hexane (Carlo Erba, France, 95%), sodium bicarbonate (NaHCO3) (GCC, U.K., 99.5%), sodium hydroxide (NaOH) (GCC, U.K.,
99.5%), chloroform (Carlo Erba, France, 99.9%), and dimethyl sulfoxide
(DMSO) (Carlo Erba, France, 99%) and monochloroacetyl chloride (α
Chemika, India) were used.