1,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine) → 5-Cyclopropyl-2-(4-fluorophenyl)-N-methyl-6-(N-(3-methyl-4-nitrophenyl)methylsulfonamido)benzofuran-3-carboxamide

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To the mixture of 6-(N-(3-chloro-4-nitrophenyl)methylsulfonamido)-5-cyclopropyl-2-(4-fluorophenyl)-N-methylbenzofuran-3-carboxamide (2.5 g, 4.48 mmol) and DABAL-Me3 (1.366 g, 5.38 mmol) in dry Tetrahydrofuran (10 mL) under nitrogen atmosphere was added Pd2(dba)3 (0.041 g, 0.045 mmol) and Xantphos (0.052 g, 0.090 mmol) and the reaction was refluxed at 100° C. for 0.5 h. Reaction mixture was filtered through Celite and washed with methanol (50 mL). After evaporation of the solvent, the crude was redissolved in DCM and washed with water. DCM was dried over anhydrous Na2SO4 and evaporated to give the title compound as a yellow solid in 82% yield. 1H NMR (400 MHz, DMSO-d6) δ ppm: 8.02 (d, J=9.2 Hz, 1H), 7.86-7.93 (m, 2H), 7.55 (d, J=1.8 Hz, 2H), 7.17-7.27 (m, 4H), 5.80 (d, J=4.5 Hz, 1H), 3.22-3.44 (m, 3H), 3.02 (d, J=4.9 Hz, 3H), 2.47-2.66 (m, 3H), 1.88-2.11 (m, 1H), 1.03 (br. s., 1H), 0.89 (d, J=7.2 Hz, 2H), 0.62 (br. s., 1H). LCMS (m/z, ES+)=538 (M+H+).

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