反应详情

Sodium triacetoxyborohydride (72.4 mg, 0.341 mmol, 1.5 equiv) was added to a suspension of 8-(2,6-difluoro-3,5-dimethoxy-phenyl)-quinoxaline-5-carboxylic acid (4-formyl-1H-imidazol-2-yl)-amide (100 mg, 0.228 mmol) (Example 185) and methylamine (40% wt in H2O, 40 μL, 0.455 mmol, 2 equiv) in DCM (4 mL) at rt, under an argon atmosphere. The reaction mixture was stirred for 4 h at rt. After further addition of sodium triacetoxyborohydride (72.4 mg, 0.341 mmol, 1.5 equiv), the reaction mixture was stirred for additional 16 h at rt. Then, methylamine (50 μL) and sodium triacetoxyborohydride (150 mg) were added. The reaction mixture was stirred for 4 h at rt, diluted with EtOAc/saturated aqueous solution of NaHCO3 and extracted with DCM. The organic phase was dried (Na2SO4), filtered and concentrated. The residue was purified by silica gel column chromatography (DCM/MeOH/NH3aq, 91.5:7.5:1) to afford 41 mg of the title compound as a yellow solid: ES-MS: 455 [M+H]+; tR=3.00 min (System 1); TLC: Rf=0.10 (DCM/MeOH/NH3aq, 91.5:7.5:1).

1. stirringthe reaction mixture was stirred for additional 16 h at rt
2. stirringThe reaction mixture was stirred for 4 h at rt
3. extractionextracted with DCM
4. dry with materialThe organic phase was dried (Na2SO4)
5. filtrationfiltered
6. concentrationconcentrated
7. customThe residue was purified by silica gel column chromatography (DCM/MeOH/NH3aq, 91.5:7.5:1)