trans-4-benzyltetrahydro-2H-furo[3,4-b][1,4]oxazin-3(4H)-one → trans-4-benzylhexahydro-2H-furo[3,4-b][1,4]oxazine

Participants

Reaction Conditions

Reaction Steps

To a solution of trans-4-benzyltetrahydro-2H-furo[3,4-b][1,4]oxazin-3(4H)-one (3.1 g, 13.2 mmol) in THF (35 mL) at 0° C. was added BH3:THF (1.0 M in THF; 39.7 mL, 39.7 mmol). The reaction mixture was stirred at 0° C. for 16 hours. The reaction was quenched with aqueous 1 N NaOH solution, adjusting to pH 13, and extracted with EtOAc (100 mL). The organic extract was washed with brine (40 mL), dried over anhydrous Na2SO4, and concentrated under reduced pressure to afford trans-4-benzylhexahydro-2H-furo[3,4-b][1,4]oxazine. 1H NMR (400 MHz, CDCl3) δ 7.29-7.31 (m, 5H), 3.96 (t, J=7.2 Hz, 1H), 3.92 (ddd, J=11.6, 3.6, 1.2 Hz, 1H), 3.86 (m, 1H), 3.67-3.77 (m, 2H), 3.52-3.66 (m, 3H), 3.45 (dd, J=12.0, 9.0 Hz, 1H), 3.34 (d, J=13.2 Hz, 1H), 2.71 (ddd, J=12.0, 2.8, 1.2 Hz, 1H), 2.42 (ddd, J=15.6, 8.8, 6.8 Hz, 1H). MS APCI calc'd for C13H17NO2 [M+H]+ 220. found 220.

Provenance & Evidence