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Rhodium(III)-catalyzed sequential ortho-C–H oxidative arylation/cyclization of sulfoxonium ylide to afford 4H-furo[2,3-c]benzopyran-4-one (7). Reagents and conditions: [Cp*RhCl2]2 (5 mol %), AgBF4 (20 mol %), Zn(OAc)2 (0.225 mmol), AcOH (0.3 mmol), and acetone (2 mL), 12 h, in a sealed Schlenk tube under N2 at 100 °C, 25% yield.
