反应详情

4-[4-(3-Cyclohexylpropoxy)-2-oxopyridin-1(2H)-yl]-2-methyl-2-(methylsulfonyl)butanoic acid (190 mg, 0.451 mmol) and CDMT (95.6 mg, 0.539 mmol) were charged into a flask. The flask was flushed with nitrogen and 2-MeTHF (10 ml) was added, followed by NMM (64 uL, 0.581 mmol). The reaction mixture was stirred at RT for 1 hour. O-(tetrahydro-2H-pyran-2-yl)hydroxylamine (64 mg, 0.539 mmol) was added to the reaction mixture and stirred for 16 hours at RT. Water (25 ml) was added, the layers were separated and the aqueous layer was extracted with EtOAc (3×50 ml). The organic layers were combined and dried over sodium sulfate, filtered and concentrated in vacuo. Crude material was purified by chromatography on silica gel (70% heptane:30% ethyl acetate to 100% ethyl acetate) to afford a white solid (220 mg, 79%). MS (LC/MS) m/z 511.1 (M−1) 1H NMR (400 MHz, METHANOL-d4) δ ppm 0.93 (t, J=7.02 Hz, 3 H) 1.12-1.42 (m, 9 H) 1.49-1.99 (m, 10 H) 2.25-2.43 (m, 1 H) 2.45-2.64 (m, 1 H) 3.12 (d, J=5.07 Hz, 3 H) 3.51-3.68 (m, 2 H) 3.82-4.03 (m, 4 H) 4.08-4.26 (m, 2 H) 5.03-5.14 (m, 1 H) 5.94 (d, J=2.54 Hz, 1 H) 6.07-6.21 (m, 1 H) 7.45-7.60 (m, 1 H).

1. customThe flask was flushed with nitrogen and 2-MeTHF (10 ml)
2. additionwas added
3. stirringstirred for 16 hours at RT
4. customthe layers were separated
5. extractionthe aqueous layer was extracted with EtOAc (3×50 ml)
6. dry with materialdried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customCrude material was purified by chromatography on silica gel (70% heptane:30% ethyl acetate to 100% ethyl acetate)