反应详情

To a solution of 5-benzyl-2-(2,5-difluorophenyl)oxazole-4-carbaldehyde (898 mg, 3.0 mmol) in THF (30.0 mL) was added (±)-2-methylpropane-2-sulfinamide (364 mg, 3.0 mmol), and Ti(OEt)4 (1.37 mL, 6.6 mmol). The reaction mixture was stirred for 4 h at room temperature. The reaction mixture was diluted with brine (30 mL) and EtOAc (60 mL) followed by addition of Celite®. Then, the mixture was vigorously stirred for 1 h, and filtered. The filtrate was extracted by EtOAc. The organic layers was washed with water and brine, dried over anhydrous Na2SO4, filtered, and concentrated. The crude product (770 mg, 64%) was purified by automatic column chromatography to yield (±)—N-((5-benzyl-2-(2,5-difluorophenyl)oxazol-4-yl)methylene)-2-methylpropane-2-sulfinamide as pale yellow solid. LC/MS (uplc): MH+ 403.0, 1.21 min.

1. additionfollowed by addition of Celite®
2. stirringThen, the mixture was vigorously stirred for 1 h
3. filtrationfiltered
4. extractionThe filtrate was extracted by EtOAc
5. washThe organic layers was washed with water and brine
6. dry with materialdried over anhydrous Na2SO4
7. filtrationfiltered
8. concentrationconcentrated
9. customThe crude product (770 mg, 64%) was purified by automatic column chromatography