Diisopropylethylamine → HCID 90051758, compound

Participants

Reaction Steps

To N-Boc-N-methyl-L-alanine (2.03 g), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (3.81 g) and 1-hydroxybenzotriazole monohydrate (2.70 g), N,N-dimethylformamide (20 mL) was added at room temperature, and the mixture was stirred at the same temperature for 2 hours. To the reaction mixture, N,N-diisopropylethylamine (5.2 mL) and 3-ethynylaniline (1.17 g) were added at room temperature, and the mixture was stirred at the same temperature for 1 hour and 30 minutes. To the reaction mixture, saturated aqueous sodium hydrogencarbonate and ethyl acetate were added. The organic layer was separated, washed successively with saturated aqueous sodium hydrogencarbonate and saturated aqueous sodium chloride, and then dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The obtained residue was purified by silica gel column chromatography (eluent, 80 to 50% hexane in ethyl acetate) to obtain (S)-tert-butyl (1-((3-ethynylphenyl)amino)-1-oxopropan-2-yl)(methyl)carbamate (G1, 626 mg) as white solid.

Provenance & Evidence