Trifluoroacetic acid → 5-Chloro-6-[(1-methylethyl)oxy]-1-(4-piperidinyl)-1,3-dihydro-2H-benzimidazol-2-one

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A solution of 1,1-dimethylethyl 4-{5-chloro-6-[(1-methylethyl)oxy]-2-oxo-2,3-dihydro-1H-benzimidazol-1-yl}-1-piperidinecarboxylate (D86, 140 mg, 0.34 mmol) in dichloromethane (3 ml) was treated with trifluoroacetic acid (3 ml) and stirred at room temperature under argon for 1 hr. The mixture was concentrated under vacuum and the residue treated with 10% Na2CO3 solution and extracted with ethyl acetate (×3). The combined extract was dried (MgSO4) and concentrated under vacuum to leave the title compound as a red oil (94 mg, 83%). M++H=310.0.

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