Ethyl 2-hydroxyisobutyrate → HCID 59430950, compound

Temperature

0 °C

A solution of 2-hydroxy-2-methyl-propionic acid ethyl ester (2.64 g, 2.7 mL, 20 mmol) in N,N-dimethylformamide (20 mL) was stirred at 0° C. under nitrogen. Sodium hydride (60% dispersion in oil, 880 mg, 22 mmol) was added and the reaction mixture was stirred at 0° C. for 5 min. Allyl bromide (2.18 g, 1.6 mL, 18 mmol) was added and the reaction mixture was stirred at 0° C. for 30 min and then at room temperature for 18 h. The reaction mixture was cooled to 0° C. and saturated ammonium chloride solution was cautiously added to quench the reaction. Diethyl ether was added and the organic layer was separated, washed with water (3×) and brine. The organic solution was filtered through a hydrophobic frit and the filtrate was evaporated. The residue was purified by silica gel chromatography using a gradient of pentane/diethyl ether 12:1 to 4:1 to afford the title compound (2.33 g, 67%) as an clear oil. 1H NMR (300 MHz, CDCl3) δ 1.31 (t, J=7.1 Hz, 3H), 1.47 (s, 6H), 3.95-3.98 (m, 2H), 4.21 (q, J=7.1 Hz, 2H), 5.15-5.20 (m, 1H), 5.27-5.39 (m, 1H), 5.90-6.03 (m, 1H). LCMS (m/z) 195.2 [M+Na], Tr=2.24 min.

1. stirringthe reaction mixture was stirred at 0° C. for 30 min
2. waitat room temperature for 18 h
3. temperatureThe reaction mixture was cooled to 0° C.
4. customto quench
5. customthe reaction
6. customthe organic layer was separated
7. washwashed with water (3×) and brine
8. filtrationThe organic solution was filtered through a hydrophobic frit
9. customthe filtrate was evaporated
10. customThe residue was purified by silica gel chromatography

ORD record

ord-6f0b9e8fb1d541d8bb3d3a4f9334dbff

Source dataset

uspto-grants-2015_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09062092B2