Water → 2-[5-Ethynyl-1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazol-2-yl]-pyrrolidine-1-carboxylic acid tert-butyl ester

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Reaction Steps

2-[5-Formyl-1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazol-2-yl]-pyrrolidine-1-carboxylic acid tert-butyl ester (1.625 g, 4.11 mmol) and dimethyl-1-diazo-2-oxopropylphosphonate (1.056 g, 5.50 mmol) were dissolved in 1:1 MeOH/THF (10 mL) and potassium carbonate (1.14 g, 8.25 mmol) was added. After stirring for 200 min, more potassium carbonate (1.14 g, 8.25 mmol) was added. 45 min later, the reaction mixture was poured into 100 mL 1:1 water/saturated aqueous sodium bicarbonate. The aqueous phase was extracted 3 times with diethyl ether. The combined organic phases were dried with magnesium sulfate and concentrated. The crude residue was purified by silica column chromatography (20% to 45% EtOAc/hexanes) to afford 2-[5-Ethynyl-1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazol-2-yl]-pyrrolidine-1-carboxylic acid tert-butyl ester (1.234 g, 77%).

Provenance & Evidence