Hydrochloric Acid → [2-[3-(2-fluoro-ethoxyimino)-2-oxo-2,3-dihydro-pyrrolo[2,3-b]pyridin-1-ylmethyl]-1-(3-methyl-butyl)-1H-benzoimidazol-5-ylmethyl]-carbamic acid tert-butyl ester

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Reaction Steps

To a solution of 1H-pyrrolo[2,3-b]pyridine-2,3-dione 3-[O-(2-fluoro-ethyl)-oxime] (23 mg, 0.11 mmol) in DMF (1.6 mL) was added Cs2CO3 (108 mg, 0.33 mmol). After stirring for 20 minutes, [2-chloromethyl-1-(3-methyl-butyl)-1H-benzoimidazol-5-ylmethyl]-carbamic acid tert-butyl ester; HCl salt (44 mg, 0.11 mmol) was added and the resulting mixture was stirred at room temperature overnight. The solvent was removed in vacuo and the residue partitioned between ethyl acetate and water. The aqueous phase was extracted with ethyl acetate and the combined organic fractions washed with water, brine, dried over MgSO4 and evaporated. The residue was purified by flash chromatography (eluant 1%, 5% MeOH in CH2Cl2) to give [2-[3-(2-fluoro-ethoxyimino)-2-oxo-2,3-dihydro-pyrrolo[2,3-b]pyridin-1-ylmethyl]-1-(3-methyl-butyl)-1H-benzoimidazol-5-ylmethyl]-carbamic acid tert-butyl ester (53 mg, 72%) as an off-white solid:

Provenance & Evidence