反应详情

6-(4-Chloro-2-methyl-phenylamino)-7-fluoro-3H-benzoimidazole-5-carboxylic acid hydrazide 20b (0.050 g, 0.150 mmol) is suspended in PhMe (2 mL) and a 20% phosgene solution in PhMe (0.24 mL, 0.45 mmol) is added. The reaction mixture is stirred at reflux under N2 for 1 hour and then cooled to room temperature. The reaction mixture is quenched by the addition of a 1:1 mixture of THF and 10% HCl (20 mL). The layers are separated and the aqueous layer is extracted with THF (3×). The combined organic layer is washed with brine, dried (Na2SO4) and concentrated under reduced pressure to give 54 mg (99%) of desired product as a yellow solid: LC/MS ESI (+) m/z 360, 362 (M+ Cl pattern) detected; 1H NMR (400 MHz, DMSO-d6) δ 12.64 (s, 1H), 8.83 (s, 1H), 7.88 (s, 1H), 7.30 (s, 1H), 7.20 (d, 1H), 7.00 (dd, 1H), 6.38 (dd, 1H), 2.30 (s, 3H).

1. temperatureat reflux under N2 for 1 hour
2. customThe reaction mixture is quenched by the addition of a 1:1 mixture of THF and 10% HCl (20 mL)
3. customThe layers are separated
4. extractionthe aqueous layer is extracted with THF (3×)
5. washThe combined organic layer is washed with brine
6. dry with materialdried (Na2SO4)
7. concentrationconcentrated under reduced pressure