Water → tert-butyl (6R,7R)-6-{[(2-{[tert-butyl(dimethyl)silyl]oxy}ethyl)amino]methyl}-7-(3,4-dichlorophenyl)-1,4-oxazepane-4-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a solution (13.2 mL) of tert-butyl (6R,7R)-7-(3,4-dichlorophenyl)-6-{[(2-hydroxyethyl)amino]methyl}-1,4-oxazepane-4-carboxylate (1.65 g) and triethylamine (0.605 mL) in THF was added, under ice-cooling, tert-butylchlorodimethylsilane (654 mg), and the mixture was stirred at room temperature overnight. Then, tert-butylchlorodimethylsilane (654 mg) and triethylamine (0.605 mL) were added, and the mixture was stirred at 50° C. for 1 hr. Distilled water was added, and the mixture was extracted with ethyl acetate. The extract was washed with distilled 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 (1.96 g).

Provenance & Evidence