Diisopropylethylamine → HCID 86679264, compound

Participants

Reaction Steps

DIPEA (0.30 mL), HATU (0.35 g) and O-benzylhydroxylamine hydrochloride (0.14 g) were added in this order, under ice cooling, to a DMF (5.0 mL) solution of 4-{[2-carboxy-1-(methylamino)-1-oxopropan-2-yl](methyl)carbamoyl}biphenyl (0.23 g) as obtained in Example 12-(2), and the mixture was stirred for 1 hour under ice cooling and for 3 hours at room temperature. A saturated aqueous solution of sodium hydrogen carbonate was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate, whereafter the desiccant was filtered out, and the solvent was distilled off under reduced pressure. The resulting residue was purified by OH type silica gel chromatography (gradient elution with hexane/ethyl acetate=70/30→0/100) and (gradient elution with chloroform/methanol=98/2→95/5) to obtain N-(benzyloxy)-2-[(biphenyl-4-ylcarbonyl)(methyl)amino]-N′,2-dimethylpropanediamide (light brown oil) (0.22 g, 75%).

Provenance & Evidence