Ammonium Chloride → Tert-butyl 7-({[tert-butyl(dimethyl)silyl]oxy}methyl)-7-(3,4-dichlorophenyl)-6-hydroxy-1,4-oxazepane-4-carboxylate

Participants

Reaction Steps

To a solution (25 mL) of tert-butyl 7-({[tert-butyl(dimethyl)silyl]oxy}methyl)-7-(3,4-dichlorophenyl)-6-oxo-1,4-oxazepane-4-carboxylate (1.34 g) in methanol was added sodium borohydride (221 mg), and the mixture was stirred at room temperature for 1 hr. To the reaction solution was added saturated aqueous ammonium chloride, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and brine, and dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel chromatography (hexane/ethyl acetate) to give the title compound (303 mg) as a high-polar diastereomer. In addition, a less polar diastereomer (836 mg) was isolated.

Provenance & Evidence