Diisopropylcarbodiimide → 2-[N-(benzyloxycarbonyl)-N-methylamino]-N-[2-(3-tert-butyl-4-hydroxyphenyl)-1-methylethyl]-3-methylbutanamide

Participants

Reaction Steps

To a solution of 0.31 g (1.50 mmol) of 2-(3-tert-butyl-4-hydroxyphenyl)-1-methylethylamine, 0.40 g (1.50 mmol) of Z-N-Me-Val-OH and 0.30 g (2.25 mmol) of HOBT in DMF (5 ml), 0.35 ml (2.25 mmol) of DIC was added under cooling with ice. After being stirred at room temperature for 2 hours, the reaction mixture was diluted with ethyl acetate and washed successively with saturated aqueous NaHCO3, water and saturated brine. The organic layer was dried with anhydrous magnesium sulfate and concentrated under reduced pressure; the resulting residue was subjected to silica gel column chromatography (eluting solvent; chloroform:methanol=125:1) to give 2-[N-(benzyloxycarbonyl)-N-methylamino]-N-[2-(3-tert-butyl-4-hydroxyphenyl)-1-methylethyl]-3-methylbutanamide in the amount of 0.55 g (81%).

Provenance & Evidence