Chloroform → HCID 86597891, compound

Participants

Reaction Steps

To a solution of tert-butyl (4S)-4-amino-5-{[1-methyl-5-(tritylamino)-1H-pyrazol-4-yl]amino}-5-oxopentylcarbamate (1.71 g) in tetrahydrofuran (30 ml) was added N-[2-(tert-butoxycarbonylamino)acetoxy]-succinimide (820 mg). The mixture was stirred at room temperature for 6 hours. To the reaction mixture was added chloroform (50 ml). The mixture was washed successively with 10% aqueous citric acid solution, brine and saturated aqueous sodium hydrogencarbonate solution. The organic layer was dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo to give tert-butyl (4S)-4-{[2-(tert-butoxycarbonylamino)acetyl]amino}-5-{[1-methyl-5-(tritylamino)-1H-pyrazol-4-yl]amino}-5-oxopentylcarbamate (2.1 g) as an oil.

Provenance & Evidence