反应详情

2-Amino-5-ethylthiazole (11.7 g., 91.3 mmoles) and diethyl ethoxymethylenemalonate (21.7 g., 100.43 mmoles) were combined and heated on a steam bath for 45 minutes. 2-(2,2-Dicarbethoxyethylamino)-5-ethylthiazole (27.2 g., Rf 0.6 and 0.7 respectively, on silica gel thin layer chromatography, with chloroform/1% ethanol and with 2:1 hexane:ethyl acetate as eluant) was obtained as an oil by cooling and used directly in the next step.

1. temperatureheated on a steam bath for 45 minutes
2. temperatureby cooling