4-(Bromomethyl)-1,2-dichlorobenzene → Di-tert-butyl (1S,2R,3S,4R,5R,6R)-2-[(tert-butoxycarbonyl)amino]-3-[(3,4-dichlorobenzyl)oxy]-4-hydroxybicyclo[3.1.0]hexane-2,6-dicarboxylate

Participants

Reaction Steps

Add 3,4-dichlorobenzyl bromide (1.02 mL, 1.02 g, 4.26 mmol) to di-tert-butyl (1S,2R,3S,4R,5R,6R)-2-[(tert-butoxycarbonyl)amino]-3,4-dihydroxybicyclo[3.1.0]hexane-2,6-dicarboxylate (1.22 g, 2.84 mmol), tetra-n-butylammonium iodide (1.07 g, 2.84 mmol) and silver oxide (987.35 mg, 4.26 mmol) in dimethylformamide (17 mL) at room temperature. Stir overnight. Dilute with diethyl ether and hexanes (1:1), filter through celite, and then wash with ether and hexanes (1:1). The filtrate is washed with water, brine, dried over magnesium sulfate, and concentrated under reduced pressure to give a residue. The residue is purified by flash chromatography, eluting with 0-30% ethyl acetate:hexanes to give the title compound (1.7 g, 2.84 mmol, 78%): MS (m/z): 610/612 (M+Na).

Provenance & Evidence