反应详情

Ethyl 2-(3,4,5-trimethoxyphenyl)-4-methylthiazole-5-carboxylate prepared in Example 4 (6.2 g corresponding to its 0.02 mol), 6.1 g (0.1 mol) of hydrazine hydrate of purity of 82% and 150 ml of ethanol were heated for 6 hours at a temperature of 90° C. The crystals, which separated out after cooling the reaction mixture, were recrystallized from 95% aqueous ethanolic solution to obtain the object consisting of faintly yellow scale-like crystals, amounting to 3.8 g and melting at 179.5° to 181° C. at a yield of 59%.

1. customThe crystals, which separated out
2. temperatureafter cooling the reaction mixture
3. customwere recrystallized from 95% aqueous ethanolic solution
4. customto obtain the object