反应详情

A mixture of N-(4-chloro-3-isothiocyanatobenzyl)-1-(trifluoromethyl)cyclopropane carboxamide (1.71 g; 5.10 mmol) and 5-amino-2-methoxy-4-(methylamino)benzoic acid (1.00 g; 1.00 mmol) in DMF (20 mL) was stirred over night at rt. The mixture was thereafter heated to 60° C. and BSTFA (1.44 g; 5.61 mmol) was added and stirred for 1 h before the addition of DIC (0.772 g; 6.12 mmol). The resulting mixture was stirred at 80° C. for 3 h. Acetic acid (2 mL) was added and the mixture was concentrated and the residue poured in aqueous NaOH (2 M) and pH adjusted to −3-4. The mixture was extracted with EtOAc and the organic extracts were washed with brine, dried over Na2SO4, filtered and concentrated. The residue was recrystallized from EtOAc/petroleum ether to give the sub-title compound. Yield: 0.570 g (22%).

1. temperatureThe mixture was thereafter heated to 60° C.
2. stirringThe resulting mixture was stirred at 80° C. for 3 h
3. concentrationthe mixture was concentrated
4. additionthe residue poured in aqueous NaOH (2 M)
5. extractionThe mixture was extracted with EtOAc
6. washthe organic extracts were washed with brine
7. dry with materialdried over Na2SO4
8. filtrationfiltered
9. concentrationconcentrated
10. customThe residue was recrystallized from EtOAc/petroleum ether