反应详情

A solution of methyl 2-(4-(tert-butoxycarbonylamino)-1H-indazol-1-yl)-2-(4-chlorophenyl)acetate (2 g, 4.83 mmol), as described in Example 2 Step B, and tert-butyl 2-bromoacetate (1.4 g, 7.25 mmol) in THF (10 mL) was added to NaH (290 mg, 7.25 mmol, 60% in oil) dropwise at 0° C. and stirred for 30 min. The mixture was quenched with saturated NH4Cl solution, and extracted with ethyl acetate. The organic layer was washed with brine (20 mL), dried over sodium sulfate, filtered and evaporated. The residue was purified by silica gel chromatography (PE:EA=3:1) to afford the title compound. LC/MS m/z=529.2[M+H]+.

1. customThe mixture was quenched with saturated NH4Cl solution
2. extractionextracted with ethyl acetate
3. washThe organic layer was washed with brine (20 mL)
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. customevaporated
7. customThe residue was purified by silica gel chromatography (PE:EA=3:1)