反应详情

A 4.37 M solution of sodium methoxide in methanol (10 mL, 43.7 mmol) was added dropwise to a stirred suspension of 2-amino-5-bromothiazole hydrochloride (2.16 g, 10 mmol) and 3-carboxythiophenol (1.85 g, 12 mmol) in methanol (75 mL) at 0-5° C. The solution was allowed to warm to rt. for 2 h and a 4 M solution of hydrogen chloride in dioxane (15 mL, 60 mmol) was added. The suspension was stirred at rt. overnight and concentrated. The crude residue was diluted with satd. aqueous sodium bicarbonate solution (50 mL). The precipitated solid was filtered and washed with water (20 mL, 5×) and ether (20 mL, 5×). The solid was filtered and dried in vacuo at 60° C. to obtain the titled compound (1.97 g, 75%).

1. concentrationovernight and concentrated
2. additionThe crude residue was diluted with satd
3. filtrationThe precipitated solid was filtered
4. washwashed with water (20 mL, 5×) and ether (20 mL, 5×)
5. filtrationThe solid was filtered
6. customdried in vacuo at 60° C.