potassium hydroxide in ethanol 4 h; Heating;

1: 70 percent / Et3N / CH2Cl2 / 6 h / 20 °C 2: 76 percent / KOH / ethanol / 4 h / 100 °C View Scheme

1: orthoformic acid triethyl ester; Polymer: 4-phenylbutan-2-one cyclic malonic acid ester, bound to Merrifield resin 6 h; Heating; 2: monophenyl thiourea 12 h; Heating; 3: T=220 - 240°C; 0.333333 h; Further stages. Title compound not separated from byproducts.;

methanol; sodium 1.) reflux, 30 min., 2.) toluene, redlux; Yield given. Multistep reaction;