反应详情

A solution of methyl 3-amino-4-chloro-2-[(2-hydroxyethyl)amino]benzoate (1.068 g, 3.16 mmol) and 2,4-dichlorophenylisothiocyanate (0.86 g, 4.21 mmol) in tetrahydrofuran (40 mL) was stirred at 50° C. for 14 hr. The reaction mixture was concentrated in vacuo. The residue was purified by flash chromatography on silica gel eluting with a 25-70% ethyl acetate/n-hexane gradient mixture and flash chromatography on NH-silica gel eluting with a 50-100% ethyl acetate/n-hexane gradient mixture to give the title compound (686.9 mg, 1.53 mmol, 48%) as a pale orange amorphous.

1. concentrationThe reaction mixture was concentrated in vacuo
2. customThe residue was purified by flash chromatography on silica gel eluting with a 25-70% ethyl acetate/n-hexane gradient mixture and flash chromatography on NH-silica gel eluting with a 50-100% ethyl acetate/n-hexane gradient mixture