Benzoyl chloride → HCID 71152508, compound

Participants

Reaction Steps

To a solution of (3aR,4R,5R,6R,7aS)-6-(((tert-butyldimethylsilyl)oxy)methyl)-4,5-dihydroxyhexahydrobenzo[d]oxazol-2(3H)-one (2.21 g, 7.00 mmol) and 4-dimethylaminopyridine (30 mg, 0.24 mmol) in pyridine (20 mL) at 0° C. was added benzoyl chloride (3.92 g, 27.9 mmol) dropwise. The mixture was stirred at room temperature for 20 h. The reaction was diluted with EtOAc (300 mL), washed with saturated aqueous NaHCO3 water (2×150 mL), 0.5 N HCl (2×100 mL) and brine and dried over MgSO4. The solvent was evaporated to give the crude product. This was purified by basic alumina column, eluted with 10-30% EtOAc in hexanes to provide (3aS,4R,5R,6R,7aS)-6-(((tert-butyldimethylsilyl)oxy)methyl)-2-oxooctahydrobenzo[d]oxazole-4,5-diyl dibenzoate (3.29 g, 90%). 1H NMR (400 MHz, CDCl3) δ 7.92-7.97 (m, 4H), 7.49-7.53 (m, 2H), 7.35-7.39 (m, 4H), 6.07 (s, 1H), 5.53 (t, J=10.1 Hz, 1H), 5.13 (dd, J=9.6 Hz, 6.6 Hz, 1H), 4.91-4.94 (m, 1H), 3.89 (t, J=7.0 Hz, 1H), 3.79 (dd, J=10.0 Hz, 4.0 Hz, 1H), 3.61 (dd, J=10.0 Hz, 2.6 Hz, 1H), 2.40 (dt, J=15.5 Hz, 3.0 Hz, 1H), 2.27-2.36 (m, 1H), 2.03-2.11 (m, 1H), 0.87 (s, 9H), −0.03 (s, 3H), −0.07 (s, 3H).

Provenance & Evidence