m-Chloroperbenzoic acid → Pyridine, 3-bromo-5-ethoxy-, 1-oxide

To a solution of 3-bromo-5-ethoxypyridine (53 g, 262 mmol) in DCM (200 mL) at 0° C. was slowly added m-CPBA (67.9 g, 393 mmol) over 30 min. After the resulting solution was stirred for 15 h, the mixture was washed with NaS2O3 solution and extracted with DCM (2×300 mL), dried over Na2SO4 and the organic phase was concentrated to give 3-bromo-5-ethoxypyridine 1-oxide (40 g, 165 mmol, 62.9% yield): 1H NMR (400 MHz, CD3OD) δ 8.19-8.18 (m, 1H), 8.08-8.07 (m, 1H), 7.50-7.49 (m, 1H), 4.17-4.15 (d, J=8.8 Hz, 2H), 1.43 (t, J=7.0 Hz, 3H); ES-LCMS m/z 217 (M+H).

1. customat 0° C.
2. customover 30 min
3. washthe mixture was washed with NaS2O3 solution
4. extractionextracted with DCM (2×300 mL)
5. dry with materialdried over Na2SO4
6. concentrationthe organic phase was concentrated

ORD 기록

ord-d800b2131ed54696b244db21bf01cfaa

출처 데이터셋

uspto-grants-2015_05

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US09035063B2