Cesium carbonate → 1-[6-(2-Chlorophenyl)-5-(4-chlorophenyl)furo[2,3-b]pyridin-2-yl]-2,2-dimethylpropan-1-one

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To a solution of 0.38 g of the product of Step A dissolved in 3 mL of DW, was added 0.14 mL (1.07 mmol) of 1-chloropinacolone and 0.65 g of Cs2CO3. After stirring for 2 h, another 0.05 mL (0.38 mmol) of 1-chloropinacolone was added and the stirring was continued for another 1 h. Additional 0.325 g (1 mmol) of Cs2CO3 was added and the solution was heated in a 60° C. bath for 3 h. The solution was cooled, diluted with Et2O, washed with water, brine, dried and concentrated. The residue was purified on a prep TLC plate using 20% EtOAc/hexane as eluant to afford the title compound. HPLC/MS: 424 (M+1), 426 (M+3); Rt=4.49 min.

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