1,8-Diazabicyclo(5.4.0)undec-7-ene → Ethyl 3-{[1-(biphenyl-4-ylmethyl)-4,6-difluoro-5-iodo-1H-benzimidazol-2-yl]oxy}cyclopentanecarboxylate

Participants

Reaction Conditions

Reaction Steps

To a solution of 1-(biphenyl-4-ylmethyl)-4,6-difluoro-5-iodo-2-(methylsulfonyl)-1H-benzimidazole (Intermediate 5, 0.650 g, 1.24 mmol) and ethyl 3-hydroxycyclopentanecarboxylate (Intermediate 9, 0.784 g, 4.96 mmol) in 4 mL of DMF was added DBU (0.747 mL, 4.96 mmol) dropwise via syringe. The reaction was heated overnight at 80° C., and then diluted with EtOAc and H2O. The layers were separated and the aqueous layer was extracted with EtOAc. The combined organic layers were washed with brine, dried over Na2SO4, filtered, and concentrated. Purification of the resulting residue by flash chromatography (3-25% EtOAc/hexanes) afforded the desired product. LCMS: calculated for C28H25F2IN2O3 602.41, observed m/e 602.9 (M+H)+ (Rt 2.57/4 min).

Provenance & Evidence