Methanol → Methyl oxolane-3-carboxylate

To a solution of tetrahydro-3-furancarboxylic acid (10.00 g, 86.0 mmol) in MeOH (172 mL) was added sulfuric acid (13.8 mL, 258 mmol). The reaction was heated to reflux for 18 h. The reaction was then cooled to rt and concentrated. The residue was partitioned between water (500 mL) and DCM (200 mL). The phases were separated and the aqueous fraction was extracted with DCM (200 mL). The combined organic fractions were washed with saturated aqueous NaHCO3 (200 mL) and brine (200 mL), dried over Na2SO4, filtered, and concentrated to afford methyl tetrahydro-3-furancarboxylate (10.1 g, 78 mmol, 90% yield) as a pale yellow oil. 1H NMR (400 MHz, CDCl3) δ ppm 3.99 (t, J=8.4 Hz, 1H), 3.86-3.95 (m, 2H), 3.76-3.86 (m, 1H), 3.71 (s, 3H), 3.01-3.18 (m, 1H), 2.03-2.32 (m, 2H).

1. temperatureThe reaction was heated
2. temperatureto reflux for 18 h
3. concentrationconcentrated
4. customThe residue was partitioned between water (500 mL) and DCM (200 mL)
5. customThe phases were separated
6. extractionthe aqueous fraction was extracted with DCM (200 mL)
7. washThe combined organic fractions were washed with saturated aqueous NaHCO3 (200 mL) and brine (200 mL)
8. dry with materialdried over Na2SO4
9. filtrationfiltered
10. concentrationconcentrated

ORD 기록

ord-18e827fc25be46fb9019f14c78d4f0aa

출처 데이터셋

uspto-grants-2016_01

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US09233956B2