Trifluoroacetic acid → HCID 66754850, compound

Participants

Reaction Steps

520 (0.76 mmol) of tert-butyl 4-(2-{2-[6-chloro-3-(4-methoxybenzenesulfonyl)-2-oxo-2,3-dihydrobenzimidazol-1-yl]-2-phenyl-acetylamino}-ethyl)piperazine-1-carboxylate (Example 130) were dissolved in dichlormethane (6 ml) and, while stirring at room temperature, trifluoroacetic acid (4 ml) was added. The reaction solution was stirred for 2 h and then the solvent and excess trifluoroacetic acid were removed in vacuo. The residue was taken up once again in toluene, concentrated in vacuo and then dried in vacuo. The residue was dissolved in 6 ml of dichloromethane, mixed with 3 eq. of MP carbonate (Argonaut, 1.69 mmol/g) and stirred at room temperature for 2 h. The solid phase reagent was filtered off and washed with dichloromethane. The filtrate was concentrated under reduced pressure and dried in vacuo. Yield: 430 mg (97%) of colorless oil.

Provenance & Evidence