(7S)-3-((S)-1-(4-bromophenyl)ethyl)-7-((2-methyloxiran-2-yl)methyl)-7-phenyl-1,3-oxazepan-2-one → (S)-3-((S)-1-(4-bromophenyl)ethyl)-7-(2-hydroxy-2-methylpropyl)-7-phenyl-1,3-oxazepan-2-one

Participants

Reaction Steps

To a solution of (7S)-3-((S)-1-(4-bromophenyl)ethyl)-7-((2-methyloxiran-2-yl)methyl)-7-phenyl-1,3-oxazepan-2-one (280 mg, 0.63 mmol) in THF (10 mL) was added dropwise 1 M LiEt3BH in THF (Super-hydride, 6.3 mL, 6.3 mmol) at 0° C. under N2 for 30 min. The resulting solution was stirred at room temperature for 1 h, quenched with H2O2 (7 mL), diluted with (CH3)3COCH3 (30 mL), washed with water, 30% aq Na2S2O3 and brine. The organic phase was dried over Na2SO4, and concentrated to give the crude product, which was purified by prep TLC afford (S)-3-((S)-1-(4-bromophenyl)ethyl)-7-(2-hydroxy-2-methylpropyl)-7-phenyl-1,3-oxazepan-2-one (150 mg, 53%). (S)-3-((S)-1-(4-bromophenyl)ethyl)-7-(2-hydroxy-2-methylpropyl)-7-phenyl-1,3-oxazepan-2-one. LC-MS Method 30-90 tR=1.199 min, m/z=470; 1H NMR (CDCl3) d 0.83 (s, 3H), 1.05 (m, 1H), 1.13 (s, 3H), 1.42 (m, 1H), 1.48 (d, 3H), 2.1-2.35 (m, 4H), 2.72 (m, 1H), 3.13 (m, 1H), 3.95 (s, 1H), 5.50 (m, 1H), 7.02 (d, 2H), 7.22 (m, 1H), 7.30 (m, 2H), 7.32-7.48 (m, 4H).

Provenance & Evidence