“…In the past, phenacyl halide quaternary salts of pyridine, picoline, nicotinamide, ethylnicotinate, quinoline and 3-methylisoquinoline were synthesized for testing their biological activities [1,2] whereas pyridine derivatives also have been investigated for a wide variety of biological aspects including cholesterol-solubilizing [3], oral hypoglycemic [4−8], antitumor [9−13], antibacterial and antimicrobial activities [14−16]. Recently, one of the derivatives of nicotinic acid, 1,2-dihydro-2-oxo-6-(2,2dimethylpropyl)-3-pyridinecarboxylic acid (U-56324), showed hypoglycemic activity in 18 h fasting normal rats and in vitro stimulation of insulin secretion [17− 19].…”