Trifluoroacetic acid → HCID 66754782, compound

Participants

Reaction Steps

122 mg (0.17 mmol) of tert-butyl 4-(4-{2-[6-chloro-3-(4-methoxybenzenesulfonyl)-2-oxo-2,3-dihydrobenzimidazol-1-yl]-2-phenylacetyl}piperazin-1-yl)piperidine-1-carboxylate (Example 127) were dissolved in dichloromethane (3 ml) and while stirring at room temperature, trifluoroacetic acid (3 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 again in toluene, concentrated in vacuo and then dried in vacuo. The residue was dissolved in 15 ml of dichloromethane/methanol (9:1), mixed with 4 eq. of Si-carbonate (Silicycle, 0.69 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: 105 mg (100%) of colorless oil.

Provenance & Evidence