L-Valine → HCID 11095658, compound

Allyl chloroformate (36.2 ml, 340.59 mmol, 1.2 eq) was added dropwise to a stirred solution of L-valine (I1)(33.25 g, 283.82 mmol, 1.0 eq) and potassium carbonate (59.27 g, 425.74 mmol, 1.5 eq) in water (650 mL) and THF (650 mL). The reaction mixture was stirred at room temperature for 18 hours, then the solvent was concentrated under reduced pressure and the remaining solution extracted with diethyl ether (3×100 mL). The aqueous portion was acidified to pH 2 with conc. HCl and extracted with DCM (3×100 mL). The combined organics were washed with brine, dried over MgSO4, filtered and concentrated under reduced pressure to afford the product as a colourless oil (57.1 g, assumed 100% yield). LC/MS (1.966 min (ES+)), m/z: 202.1 [M+H]+. 1H NMR (400 MHz, DMSO-d6) δ 12.57 (br s, 1H), 7.43 (d, 1H, J=8.6 Hz), 5.96-5.86 (m, 1H), 5.30 (ddd, 1H, J=17.2, 3.4, 1.7 Hz), 5.18 (ddd, 1H, J=10.4, 2.9, 1.6 Hz), 4.48 (dt, 2H, J=5.3, 1.5 Hz), 3.85 (dd, 1H, J=8.6, 6.0 Hz), 2.03 (oct, 1H, J=6.6 Hz), 0.89 (d, 3H, J=6.4 Hz), 0.87 (d, 3H, J=6.5 Hz),

1. concentrationthe solvent was concentrated under reduced pressure
2. extractionthe remaining solution extracted with diethyl ether (3×100 mL)
3. extractionextracted with DCM (3×100 mL)
4. washThe combined organics were washed with brine
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure

ORD record

ord-8d9c66501941436b80626aad8bf986f0

Source dataset

uspto-grants-2015_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09102704B2