反应详情

To a solution of DIEA (1.49 mL, 8.55 mmol) and 2-(3-amino-2-fluoro-6-nitrophenyl)ethyl acetate (690 mg, 2.85 mmol), as prepared in the preceding step, in DCM (6 mL) was added a solution of 2,2-difluoro-2-phenylacetyl chloride (0.99 g, 5.20 mmol), as prepared according to the procedure of step 3 of Example 1, in DCM (3 mL). After stirring for 24 hours, the mixture was concentrated, and partitioned between DCM and H2O. The organic layer was separated, and the aqueous layer extracted with DCM. The organic layers were combined, washed with H2O and brine, dried over Na2SO4, concentrated, and flash chromatographed on silica gel eluting with EtOAc/DCM (0, 2.5, and 5%) to give the title compound (1.04 g, 92% yield) as an orange oil. 1H-NMR (400 MHz, CDCl3) δ 8.49-8.43 (m, 2H), 7.87 (d, J=9.2 Hz, 1H), 6.68 (d, J=7.1 Hz, 2H), 7.55-7.49 (m, 3H), 4.35 (t, J=6.4 Hz, 2H), 3.37 (dt, J=6.3, 2.3 Hz, 2H), 2.01 (s, 3H).

1. customas prepared
2. concentrationthe mixture was concentrated
3. custompartitioned between DCM and H2O
4. customThe organic layer was separated
5. extractionthe aqueous layer extracted with DCM
6. washwashed with H2O and brine
7. dry with materialdried over Na2SO4
8. concentrationconcentrated
9. customflash chromatographed on silica gel eluting with EtOAc/DCM (0, 2.5, and 5%)