Ethyl Acetate → HCID 44231035, compound

Participants

Reaction Steps

To a stirred solution of tert-butyl (S)-1-(4-bromophenyl)ethyl(3-(4-fluorophenyl)-3-hydroxypropyl)carbamate (474 mg, 1.05 mmol) in dry THF (10 mL) was added 60% NaH in oil (250 mg, 10.4 mmol). The mixture was heated at reflux for 3 h. The mixture was diluted with water (20 mL) and. EtOAc (80 mL). The organic layer was separated, washed with 5% aq HCl (20 mL), satd aq NaHCO3 (20 mL) and brine (20 mL), and dried over Na2SO4. Removal of the solvent left an oil (348 mg). A portion of the crude product was purified by preparative HPLC to afford 3-((1S)-1-(4-bromophenyl)ethyl)-6-(4-fluorophenyl)-1,3-oxazinan-2-one as a 2:1 mixture of diastereomers based on 1H NMR. LC-MS (3 min) tR=1.92 min, m/z=380, 378. 1H NMR (CDCl3) S [selected resonances of major and minor diastereomers] 1.52 (d, major), 1.59 (d, minor), 3.06 (m, major), 3.31 (m, minor), 5.20 (dd, major), 5.25 (dd, minor).

Provenance & Evidence