General synthetic route to malonamic acids and 3-thiomalonamic acids. Amidations and thioamidations of .alpha. anions of carboxylate salts with alkyl and aryl isocyanates and isothiocyanates
General synthetic route to malonamic acids and 3-thiomalonamic acids. Amidations and thioamidations of .alpha. anions of carboxylate salts with alkyl and aryl isocyanates and isothiocyanates