Tert-butyl[2-(2-cyclohexyl-ethylsulfanyl)-benzoimidazol-1-yl]-acetate → [2-(2-Cyclohexyl-ethylsulfanyl)-benzoimidazol-1-yl]-acetic acid

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Reaction Steps

A solution of tert-butyl[2-(2-cyclohexyl-ethylsulfanyl)-benzoimidazol-1-yl]-acetate (Precursor A-01b, 42 mg, 0.13 mmol) in TFA/dichloromethane (1:1, 0.5 ml) is stirred at rt for 4 h. The solvents are removed in vacuo. The crude residue is sonicated in Et2O/heptane (1:1, 1 ml) until a solid precipitates. It is rinsed with heptane and purified by flash chromatography on silica gel (AcOEt/heptane, 1:1 containing 1% of AcOH), yielding the title compound (12 mg) in 30% as a white solid: tR=6.44 min (LC-1), ESI-MS (pos.): m/z 319.12 [M+H]+, ESI-MS (neg.): m/z 317.37 [M−H]+; 1H-NMR (CDCl3): δ (ppm) 0.82-0.94 (m, 2H), 1.09-1.23 (m, 3H), 1.37 (m, 1H), 1.54 (q, 2H, SCH2CH2), 1.68 (m, 5H), 3.34 (t, 2H, SCH2), 4.88 (s, 2H, CH2CO2), 7.22 (s, 3Harom), 7.65 (m, 1Harom).

Provenance & Evidence