Acetic Acid → HCID 18785555, compound

Participants

Reaction Steps

To a solution of 2-(2-bromobenzyl)thioaniline (7.55 g) and 1-tert-butyloxycarbonylpiperidin-4-one (6.68 g) in 2-dichloroethane (100 ml) were added acetic acid (30 ml) and sodium triacetoxyborohydride (7.1 g), and the mixture was stirred at a room temperature for 2 hours. Additional amount of sodium triacetoxyborohydride (500 mg) was added, and the mixture was further stirred at a room temperature for 2 hours. The reaction was concentrated under reduced pressure, diluted with ethyl acetate, washed successively with water, a saturated aqueous sodium hydrogen carbonate solution, and water, dried over magnesium sulfate, and the solvent was removed. The residue thus obtained was purified by chromatography on a silica gel column (250 g) to give the title compound as a resinous product (11.2 g, 91%) from the fraction eluted with n-hexane:ethyl acetate=5:1.

Provenance & Evidence