Toluene → HCID 67218888, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 0.105 g of 4-(4-bromo-phenyl)-4-[5,6-dichloro-1-(2-trimethylsilanyl-ethoxymethyl)-1H-benzoimidazol-2-yloxymethyl]-piperidine-1-carboxylic acid tert-butyl ester 51 (0.144 mmol, 1 eq), 0.024 g of 3-cyanophenyl boronic acid (0.16 mmol, 1.1 eq), and 0.034 g of Pd(PPh3)4 (0.03 mmol, 20 mol %) was mixed with 3 mL of toluene, 2 mL of ethanol and 1 mL of 2M aqueous Na2CO3 and then heated at 80° C. for 20 h while stirring. The reaction was allowed to cool to room temperature, diluted with 25 mL of ethyl acetate and washed with 25 mL of saturated brine. The organic extracts were dried over Na2SO4, filtered and concentrated by rotary evaporation to give the crude product which was purified by flash column chromatography eluting with a gradient of 5-20% ethyl acetate in hexane to give 0.081 g of 4-(3′-cyano-biphenyl-4-yl)-4-[5,6-dichloro-1-(2-trimethylsilanyl-ethoxymethyl)-1H-benzoimidazol-2-yloxymethyl]-piperidine-1-carboxylic acid tert-butyl ester 52 as a pale foam: 1H NMR (300 MHz, CDCl3): δ 7.82-7.76 (m, 2H), 7.59-7.48 (m, 7H), 7.13-7.10 (m, 1H), 5.17 (s, 2H), 4.53 (s, 2H), 3.85-3.80 (br. d, 2H), 3.41-3.36 (t, 2H), 3.18-3.10 (t, 2H), 2.36-2.3 (d, 2H), 2.00-1.96 (t, 2H), 1.44 (s, 9H), 0.83-0.77 (t, 2H), 0.10 (s, 9H).

Provenance & Evidence