Potassium Phosphate, Tribasic → HCID 86708781, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of methyl S)-1-((S)-2-(6-(7-bromo-9,10-dihydrophenanthren-2-yl)-1H-benzo[d]imidazol-2-yl)pyrrolidin-1-yl)-3-methyl-1-oxobutan-2-ylcarbamate (376 mg, 0.62 mmol), bis(pinacolato)diboron (167 mg, 0.66 mmol), PdCl2(dppf) (23 mg, 0.03 mmol) and potassium acetate (184 mg, 1.9 mmol) in dioxane (3 mL) was degassed with a stream of argon for twenty minutes. The reaction was heated to 100° C. After 1 hour, the mixture was cooled to room temperature. To the reaction was added (S)-tert-butyl 2-(5-bromo-1H-imidazol-2-yl)pyrrolidine-1-carboxylate (296 mg, 0.94 mmol), 2M aqueous potassium phosphate solution (0.94 mL, 1.9 mmol) and dimethoxyethane (4 mL). The reaction was degassed with a stream of argon for twenty minutes. The reaction was heated in a microwave to 130° C. for twenty minutes. After cooling, more PdCl2(dppf) (23 mg, 0.03 mmol), 2M aqueous potassium phosphate solution (0.47 mL, 0.94 mmol), and (S)-tert-butyl 2-(5-bromo-1H-imidazol-2-yl)pyrrolidine-1-carboxylate (98 mg, 0.31 mmol) were added and the reaction was heated in a microwave to 120° C. for 140 minutes. The reaction was removed from the microwave and heated at 110° C. overnight. After 14 hours, the reaction was diluted with ethyl acetate, and the organic phase was washed with saturated aqueous NaHCO3 solution and brine, dried (Na2SO4) and concentrated. The crude material was purified by flash column chromatography to yield (S)-tert-butyl 2-(5-(7-(2-((S)-1-((S)-2-(methoxycarbonylamino)-3-methylbutanoyl)pyrrolidin-2-yl)-1H-benzo[d]imidazol-6-yl)-9,10-dihydrophenanthren-2-yl)-1H-imidazol-2-yl)pyrrolidine-1-carboxylate (174 mg, 37%).

Provenance & Evidence