Sodium borohydride → (5-Chloropyridin-3-yl)methanol

To a solution of 5-chloro-nicotinic acid methyl ester (17.2 g, 101 mmol) in methanol (230 mL) and DCM (230 mL) at 0° C. was added sodium borohydride (16.4 g, 434 mmol). The reaction mixture was stirred at room temperature for 18 hours. After completion, the reaction mixture was concentrated under reduced pressure, diluted with water (300 mL) and extracted with AcOEt (3×300 mL). The combined organic layer was dried over sodium sulfate, filtered, and concentrated under reduced pressure. The residue was then purified by silica gel chromatography to afford (5-chloro-pyridin-3-yl)-methanol (7.8 g, 54%). 1H NMR (400 MHz, DMSO-d6) δ ppm 8.45-8.52 (m, 2 H), 7.83 (s, 1 H), 5.45 (t, J=5.8 Hz, 1 H), 4.55 (t, J=5.7 Hz, 2 H). MS m/z 144.1

1. concentrationAfter completion, the reaction mixture was concentrated under reduced pressure
2. additiondiluted with water (300 mL)
3. extractionextracted with AcOEt (3×300 mL)
4. dry with materialThe combined organic layer was dried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customThe residue was then purified by silica gel chromatography

ORD record

ord-3344d852eefa466f808769c0b38471c9

Source dataset

uspto-grants-2015_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09102591B2