1,2-Dimethoxyethane → (S)-benzyl 2-(5-(7-(2-((S)-1-(tert-butoxycarbonyl)pyrrolidin-2-yl)-1H-benzo[d]imidazol-6-yl)dibenzo[b,d]thiophen-3-yl)-1H-imidazol-2-yl)pyrrolidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of (S)-tert-butyl 2-(6-(7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)dibenzo[b,d]thiophen-3-yl)-1H-benzo[d]imidazol-2-yl)pyrrolidine-1-carboxylate (870 mg, 1.5 mmol), (S)-benzyl 2-(5-bromo-1H-imidazol-2-yl)pyrrolidine-1-carboxylate (620 mg, 1.8 mmol), tetrakis(triphenylphosphine)palladium(0) (170 mg, 0.15 mmol), PdCl2(dppf) (110 mg, 0.15 mmol), 2M aqueous potassium carbonate (2.2 mL, 4.4 mmol), dimethoxyethane (12.2 mL) and dimethylformamide (2.4 mL) was degassed with argon for 15 minutes. The reaction was then heated to 85° C. for 2 hours. Upon completion, the reaction was cooled to room temperature, diluted with ethyl acetate and filtered through Celite. The filtrate was washed with water and brine, dried (MgSO4) and concentrated. The resulting crude material was purified by flash column chromatography to yield (S)-benzyl 2-(5-(7-(2-((S)-1-(tert-butoxycarbonyl)pyrrolidin-2-yl)-1H-benzo[d]imidazol-6-yl)dibenzo[b,d]thiophen-3-yl)-1H-imidazol-2-yl)pyrrolidine-1-carboxylate (750 mg, 70%). LCMS-ESI+: calculated for C43H42N6O4S: 738.30; observed [M+1]+: 739.19.

Provenance & Evidence