Hydrochloric Acid → (R)-3-((S)-3,3-dimethylbutan-2-yl)-6-(4-fluorophenyl)-6-(3-hydroxypropyl)-1,3-oxazinan-2-one

To a solution of (R)-6-allyl-3-((S)-3,3-dimethylbutan-2-yl)-6-(4-fluorophenyl)-1,3-oxazinan-2-one (90 mg, 0.28 mmol) in dry THF (5 mL) was added dropwise 1 M BH3.THF (0.56 mL, 0.564 mmol) at 0° C. After stirring for 2 h at rt, the reaction mixture was cooled to 0° C. and water (1 mL), 3 M aqueous NaOH (0.5 mL) and 30% H2O2 (0.5 mL) were successively added. The mixture was stirred for 2-3 h at rt and was then diluted with water (6 mL). The pH was adjusted to 6-7 with 0.5 N HCl. The aqueous phase was extracted with EtOAc (3×5 mL). The combined organic layers were washed with saturated aqueous NaHCO3 solution (8 mL) and brine (8 mL), dried over Na2SO4, and concentrated in vacuo to give the crude product, which was purified by preparative TLC to afford (R)-3-((S)-3,3-dimethylbutan-2-yl)-6-(4-fluorophenyl)-6-(3-hydroxypropyl)-1,3-oxazinan-2-one (2 mg, 2%). LC-MS Method 1 tR=1.179, min, m/z=338.1; 1H NMR (CDCl3) 0.65 (s, 9H), 0.99-1.06 (d, 3H), 1.18 (m, 1H), 1.29 (m, 1H), 1.61-1.71 (m, 1H), 1.83-2.08 (m, 3H), 2.21-2.28 (m, 1H), 2.62-2.73 (m, 1H), 3.06-3.13 (m, 1H), 3.47-3.53 (m, 2H), 4.36-4.43 (m, 1H), 6.98-7.06 (m, 2H), 7.22-7.26 (m, 2H)

1. temperaturethe reaction mixture was cooled to 0° C.
2. stirringThe mixture was stirred for 2-3 h at rt
3. extractionThe aqueous phase was extracted with EtOAc (3×5 mL)
4. washThe combined organic layers were washed with saturated aqueous NaHCO3 solution (8 mL) and brine (8 mL)
5. dry with materialdried over Na2SO4
6. concentrationconcentrated in vacuo
7. customto give the crude product, which
8. customwas purified by preparative TLC

ORD record

ord-b76fca8f51fb4072bfa8f2644218b338

Source dataset

uspto-grants-2013_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08440658B2