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A reaction mixture comprising 11.2 g (0.035 mole) of N-(5-tert-butyl-1,3,4-thiadiazol-2-yl)-4-bromoacetoacetamide, 200 ml of ethanol and 2.8 g (0.037 mole) of thiourea was refluxed for 3 hours. The reaction solution was cooled and added to 300 ml of water. With stirring, there was slowly added an excess of saturated aqueous sodium bicarbonate. The product was collected and dried. There was obtained 10 g (96.2%) of white solid, m.p. 226° (dec.). N.M.R. (dimethyl-d6 sulfoxide) ∂ 1.4 [C(CH3)3 ], 3.6 (CH2), 6.3 (hetero-aromatic), 6.9 (NH).

1. temperatureThe reaction solution was cooled
2. customThe product was collected
3. customdried