反应详情

A mixture of 8-(2,6-difluoro-3,5-dimethoxy-phenyl)-quinoxaline-5-carboxylic acid (200 mg, 0.578 mmol) (Step 185.1), 2-amino-4-diethoxymethyl-imidazole-1-carboxylic acid tert-butyl ester (198 mg, 0.693 mmol, 1.2 equiv) (Step 179.8), TBTU (223 mg, 0.693 mmol, 1.2 equiv), DIEA (74.7 mg, 0.578 mmol) in DMF (4 mL) was stirred for 18 h at rt. The reaction mixture was diluted in EtOAc/H2O and extracted with EtOAc. The organic phase was washed with H2O and brine, dried (Na2SO4), filtered and concentrated. The resulting yellow foam (405 mg) was dissolved in acetone (5 mL) and H2O (3 mL) and treated with PPTS (30 mg). The reaction mixture was heated to 50° C., stirred for 2 h, allowed to cool to rt and diluted with EtOAc/H2O. The resulting yellow precipitate was collected by vacuum filtration and dried to provide 174 mg of the title compound: ES-MS: 440 [M+H]+; tR=3.89 min (System 1).

1. extractionextracted with EtOAc
2. washThe organic phase was washed with H2O and brine
3. dry with materialdried (Na2SO4)
4. filtrationfiltered
5. concentrationconcentrated
6. dissolutionThe resulting yellow foam (405 mg) was dissolved in acetone (5 mL)
7. additionH2O (3 mL) and treated with PPTS (30 mg)
8. temperatureThe reaction mixture was heated to 50° C.
9. stirringstirred for 2 h
10. temperatureto cool to rt
11. additiondiluted with EtOAc/H2O
12. filtrationThe resulting yellow precipitate was collected by vacuum filtration
13. customdried