2-Butanamine, 2-methyl- → 3-Cyclohexyl-5-ethoxy-1,3-dihydro-1-[2-methoxy-4-[N-(1,1-dimethylpropyl)carbamoyl]benzenesulfonyl]-2H-benzimidazol-2-one

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Reaction Steps

A mixture of 1.09 g of the compound obtained in EXAMPLE 13, 1 ml of 1,1-dimethylpropylamine, 1.2 g of BOP, 1 ml of DIPEA and 20 ml of DCM is stirred for 2 hours at RT. The reaction mixture is evaporated under vacuum, the residue is extracted with AcOEt, washed with a 1N solution of HCl, with a 1N solution of NaOH and with water and dried over Na2SO4 and the solvent is evaporated off under vacuum. The residue is chromatographed on silica using a DCM/AcOEt mixture (99/1; v/v) as the eluent to give 0.88 g of the expected product in the form of white crystals. M.p.=219° C.

Provenance & Evidence