Hydrogen Peroxide → HCID 66668577, compound

Temperature

0 °C

Methanol (5 mL) was added to the crude 2-cyclopropyl-3-difluoromethoxy-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (Preparation 103, 450 mg, 1.5 mmol) and the resulting solution cooled to 0° C. with stirring. Hydrogen peroxide solution (35% in water, 0.70 mL) was added over 20 minutes. The reaction mixture was then allowed to warm to room temperature and stirred for 5 hours. The reaction was quenched by addition of 1M aqueous sodium thiosulfate solution (10 mL), and rapidly stirred for 15 minutes at room temperature. The mixture were evaporated in vacuo, and brine (50 mL) was added. The residue was extracted into ethyl acetate (3×50 mL) and the combined extracts were dried over magnesium sulfate, filtered and the solvent removed to leave a brown oil. The oil was purified by flash silica gel column chromatography eluting with EtOAc:heptane 1:1 to provide the title compound as a white solid (168 mg, 58% yield).

1. temperatureto warm to room temperature
2. stirringstirred for 5 hours
3. customThe reaction was quenched by addition of 1M aqueous sodium thiosulfate solution (10 mL)
4. stirringrapidly stirred for 15 minutes at room temperature
5. customThe mixture were evaporated in vacuo, and brine (50 mL)
6. additionwas added
7. extractionThe residue was extracted into ethyl acetate (3×50 mL)
8. dry with materialthe combined extracts were dried over magnesium sulfate
9. filtrationfiltered
10. customthe solvent removed
11. customto leave a brown oil
12. customThe oil was purified by flash silica gel column chromatography
13. washeluting with EtOAc:heptane 1:1

ORD record

ord-035d11f5494b458c8a36e2d335badad6

Source dataset

uspto-grants-2015_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09102621B2