Sodium Bicarbonate → HCID 178451889, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of (S)-tert-butyl 2-(5-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)-1H-imidazol-2-yl)pyrrolidine-1-carboxylate (17) (Scheme 9; 0.138 g, 0.314 mmol), (S)-tert-butyl 2-(5-(4-iodophenyl)-1H-pyrazol-3-yl)pyrrolidine-1-carboxylate 8 (0.141 g, 0.321 mmol), NaHCO3 (0.110 g, 1.31 mmol) and Pd(PPh3)4 (0.024 g, 0.0208 mmol) in a mixture of DME (3 mL) and H2O (1 mL) was heated at 80° C. under Ar for 12 hours. The cooled mixture was diluted with ethyl acetate/H2O, the layers separated and the aqueous phase was re-extracted with ethyl acetate (2×). The combined organic layers were washed (H2O, brine) and dried (Na2SO4) and filtered and the solvent was removed in vacuo. The resulting residue was purified by flash chromatography (hexane:ethyl acetate, 2:1 and then ethyl acetate:methanol, 9:1) to give (S)-tert-butyl 2-(5-(4′-(2-((S)-1-(tert-butoxycarbonyl)pyrrolidin-2-yl)-1H-imidazol-5-yl)biphenyl-4-yl)-1H-pyrazol-3-yl)pyrrolidine-1-carboxylate (19) (0.084 g, 43%) as a yellow solid. 1H NMR (400 MHz, DMSO-d6) δ 13.01, 12.69, 12.20, 11.91, 11.85 (s, 1H), 7.63-7.85 (m, 8H), 7.50-7.56 (m, 1H), 6.52 (s, 1H), 4.75-4.94 (m, 2H), 3.42-3.58 (m, 2H), 3.30-3.39 (m, 2H, partially obscured by H2O signal), 2.10-2.28 (m, 2H), 1.81-2.01 (m, 6H), 1.40 (s, 7H), 1.20-1.23 (m, 6H), 1.13-1.15 (m, 5H). LCMS: Anal. Calcd. for C36H44N6O4: 624. found: 625 (M+H)+.

Provenance & Evidence