Potassium Carbonate → (S)-tert-butyl 2-(6-(7-bromo-9,10-dihydro-phenanthren-2-yl)-1H-benzo[d]imidazol-2-yl)-pyrrolidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of ((S)-tert-butyl 2-(6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-benzo[d]imidazol-2-yl)pyrrolidine-1-carboxylate (1.49 g, 3.6 mmol), 2,7-dibromo-9,10-dihydrophenanthrene (6.09 g, 18.0 mmol), 2M aqueous potassium carbonate solution (9 mL, 18.0 mmol), tetrakis(triphenylphosphine)palladium(0) (209 mg, 0.18 mmol) and dimethoxyethane (36 mL) was degassed with a stream of argon for twenty minutes. The reaction was heated to 85° C. After 16 hours, the reaction was cooled to room temperature and diluted with ethyl acetate. 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-(6-(7-bromo-9,10-dihydro-phenanthren-2-yl)-1H-benzo[d]imidazol-2-yl)-pyrrolidine-1-carboxylate (1.16 g, 59%).

Provenance & Evidence