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

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To a solution of 1-(biphenyl-4-ylmethyl)-4,6-difluoro-5-iodo-2-(methylsulfonyl)-1H-benzimidazole (Intermediate 5, 0.500 g, 0.954 mmol) and 2-hydroxymethyl-cyclopropanecarboxylic acid ethyl ester (Intermediate 10, 0.550 g, 3.81 mmol) in 3.2 mL of DMF was added DBU (0.575 mL, 3.81 mmol) dropwise via syringe. The reaction was heated at 80° C. for 2 h, 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. The resulting crude residue was purified on silica gel (eluted 2-15% then 15-20% EtOAc/hexanes: gradient elution) to furnish the desired product. LCMS: calculated for C27H23F2IN2O3 588.38, observed m/e 588.9 (M+H)+ (Rt 2.51/4 min).

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