反应详情

Into 200 ml of methanol, 16.9 g (0.05 mol) of 2-(3,4,5-trimethoxyphenyl)-4-methylthiazole-5-carboxylic acid ethyl ester produced in Example 3 was dissolved, and 25 ml of an aqueous 28% solution of ammonia was added to the solution. The mixture was left at room temperature for 7 days, and then condensed to dryness. The dried residue was recrystallized from a mixture of methanol and water to obtain the object amounting to 10.9 g (yield of 71%) consisting of colourless needle-like crystals melting at 196° to 197° C.

1. customcondensed to dryness
2. customThe dried residue was recrystallized from a mixture of methanol and water
3. customto obtain the object amounting to 10.9 g (yield of 71%)