Novel oxazole derivatives of the formula
wherein R1 is hydrogen or a straight, branched or cyclic alkyl group of 1 to 6 carbon atoms, R2 is hydrogen, halogen, trifluoromethyl, or a straight, branched or cyclic alkylthio of 1 to 3 carbon atoms, and n is 1 or 2 or pharmaceutically acceptable salts or esters thereof are synthesized through several routes. The derivatives have hypoglycemic, glucose tolerance improving and insulin sensitivity increasing activities and are of value as antidiabetic drugs.
Novel oxazole derivatives of the formula ##STR1## (wherein R.sup.1 is hydrogen or a straight, branched or cyclic alkyl group of 1 to 6 carbon atoms, R.sup.2 is hydrogen, halogen, trifluoromethyl, or a straight, branched or cyclic alkylthio of 1 to 3 carbon atoms, and n is 1 or 2) or pharmaceutically acceptable salts or esters thereof are synthesized through several routes. The derivatives have hypoglycemic, glucose tolerance improving and insulin sensitivity increasing activities and are of value as antidiabetic drugs.