反应详情

Intermediate 5 (142 mg, 0.992 mmol) was dissolved in ethanol (5 mL) under N2(g) atmosphere. Sodium borohydride (ALDRICH, 113 mg, 2.98 mmol) was added and mixture of reaction was stirred for 1 hour. Crude of reaction was partitioned between DCM (15 mL) and distilled water (15 mL). Aqueous layer was extracted with DCM (2×15 mL). Organic layers were dried over MgSO4(anh), filtered and concentrated to yield title compound (3,4-difluoro-2-pyridinyl)methanol (140 mg, 0.965 mmol, 97% yield). 1H NMR (400 MHz, DMSO-d6) δ ppm: 8.37-8.40 (m, 1H), 7.50-7.55 (m, 1H), 5.45 (t, 1H), 4.61-4.63 (m, 2H). [ES+MS] m/z 146 (MH+).

1. additionmixture of reaction
2. customCrude of reaction
3. customwas partitioned between DCM (15 mL)
4. distillationdistilled water (15 mL)
5. extractionAqueous layer was extracted with DCM (2×15 mL)
6. dry with materialOrganic layers were dried over MgSO4(anh)
7. filtrationfiltered
8. concentrationconcentrated