Hydrogen Peroxide → HCID 58109203, compound

Participants

Reaction Steps

To a solution of (R)-6-allyl-3-((S)-1-(2′,4′-difluorobiphenyl-4-yl)ethyl)-6-phenyl-1,3-oxazinan-2-one (0.2475 g, 0.57 mmol, 1.0 equiv) in 6 mL of dry THF was added 9-BBN (0.5 M solution in THF, 2.3 mL, 1.15 mmol, 2.0 equiv). The mixture was stirred for 3 h at rt. It was then subjected to oxidative workup by adding 3 N aqueous NaOH (6 mL) followed by careful and dropwise addition of 50% aq H2O2 (4 mL) with vigorous stirring. The reaction mixture was stirred for 1 h, extracted with CH2Cl2, and dried over Na2SO4. Surprisingly, the reductive product was observed instead of hydroboration-oxidation. After the solvent was evaporated under reduced pressure, the residue was purified by reversed-phase HPLC (SunFire™ Prep C18 OBD™ 5 μm 19×50 mm column, 10%→90% CH3CN/H2O, 0.1% CF3COOH over 8 min and then 90% CH3CN/H2O, 0.1% CF3COOH over 2 min, flow rate 20 mL/min) to afford 0.0902 g of (R)-3-((S)-1-(2′,4′-difluorobiphenyl-4-yl)ethyl)-6-phenyl-6-propyl-1,3-oxazinan-2-one LC-MS Method 1 tR=2.22, min, m/z=436; 1H NMR (400 MHz, CD3OD) δ 7.33-7.14 (m, 8H), 6.96-6.87 (m, 4H), 5.48 (q, J=7.0 Hz, 1H), 3.01-2.96 (m, 1H), 2.41-2.36 (m, 1H), 2.29-2.21 (m, 1H), 2.14-2.07 (m, 1H), 1.81-1.72 (m, 2H), 1.46 (d, J=7.0 Hz, 3H), 1.39-1.29 (m, 1H), 1.08-0.98 (m, 1H), 0.76 (t, J=7.5 Hz, 3H); 19F NMR (376 MHz, CD3OD) δ −113.79 (m), −115.77 (m).

Provenance & Evidence