反应详情

(S)-3,5-dichloro-4-(2-(3-(cyclopropylmethoxy)-4-(difluoromethoxy)phenyl)-2-hydroxyethyl)pyridine 1-oxide (100 mg, 0.238 mmol) was placed in a 50 ml round bottom flask and dissolved in DMF (3 ml), EDC (45.6 mg, 0.238 mmol), and 2-(5-nitro-1,3-dioxoisoindolin-2-yl)acetic acid (60 mg, 0.238 mmol) were added to it followed by DMAP (29.1 mg, 0.238 mmol). The reaction was stirred at RT for 6 hours. The reaction was quenched by adding 30 ml of HCl/H2O (1M) and extracted with EtOAc (30 ml). The organic phase (EtOAc) was extracted with HCl/H2O (1M; 30 ml; ×3) and subsequently with K2CO3/H2O (15% w/w; 20 ml; ×3) by using a 100 ml extracting funnel. The resulting organic extract was dried over Na2SO4 (0.5 g), filtered on a filter paper, and the solvent removed under reduced pressure. The oil residue was purified by preparative HPLC (Method 2) to yield 120 mg of desired product (yield=77%). 1H NMR (400 MHz, acetone) δ ppm 8.35 (d, J=7.50 Hz, 1H), 8.24-8.30 (m, 1H), 8.16-8.24 (m, 3H), 7.16-7.25 (m, 2H), 7.05 (dd, J=8.16, 1.98 Hz, 1H), 6.94 (t, 1H, CHF2), 6.14 (dd, J=9.48, 4.63 Hz, 1H), 4.52 (s, 2H), 4.01 (dd, J=6.62, 3.97 Hz, 2H), 3.54 (dd, J=14.33, 9.48 Hz, 1H), 3.26-3.40 (m, 1H), 1.25-1.38 (m, 1H), 0.56-0.73 (m, 2H), 0.36-0.48 (m, 2H). MS/ESI+ [MH]+=652.1

1. customThe reaction was quenched
2. additionby adding 30 ml of HCl/H2O (1M)
3. extractionextracted with EtOAc (30 ml)
4. extractionThe organic phase (EtOAc) was extracted with HCl/H2O (1M; 30 ml; ×3) and subsequently with K2CO3/H2O (15% w/w; 20 ml; ×3)
5. extractionextracting funnel
6. extractionThe resulting organic extract
7. dry with materialwas dried over Na2SO4 (0.5 g)
8. filtrationfiltered on a filter paper
9. customthe solvent removed under reduced pressure
10. customThe oil residue was purified by preparative HPLC (Method 2)