Triethylamine → (R)-(-)-2-methyl-2-[3-[1-(1-tert-butylcarbonylmethyl-2-oxo-5-cyclohexyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepin-3-yl)ureido]phenoxy]propionic acid benzyl ester

Participants

Reaction Conditions

Reaction Steps

Benzyl 2-methyl-2-(3-aminophenoxy)propionate (200 mg) was dissolved in tetrahydrofuran (5 ml), the solution was cooled to internal temperature 5-8° C. Triphosgene (77 mg) was added, stirred for 5 minutes. Subsequently, triethylamine (0.36 g) was added every 5 minutes after divided into two portions. The mixture was stirred at room temperature for 10 minutes, a solution of (R)-1-tert-butylcarbonylmethyl-2-oxo-3-amino-5-cyclohexyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine (230 mg) in tetrahydrofuran (5 ml) was added to the mixture, stirred for one hour. Water and chloroform were added to the reaction mixture, and extracted. The organic layer was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, the residue was purified by silica gel column chromatography(chloroform), to thereby obtain 310 mg of the title compound as pale yellow oil (Yield: 72.4%).

Provenance & Evidence