Oxidation of aroylthioureas during their reactions with 2,3-diphenylcyclopropenone resulting in (E/Z)-3-(aroylthioureido)-2-phenylcinnamic acids

Isolated (E/Z)-3-(aroylthioureido)-2-phenylcinnamic acids have been obtained from the reactions of N-substituted-aroylthioureas with 2,3-diphenylcyclopropenone in acetic acid. The abnormal behavior of the reaction was described as due to nucleophilic addition of N ³ followed by hydrolysis, ring opening and oxidation processes.