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A facile synthesis of 4H-furo[3,2-c]benzopyran-4-ones 19 by silver(I)/celite promoted an oxidative cycloaddition reaction. Reagents and conditions: (a) CH2=CHSPh and/or CH3CH=CHSPh, Ag2CO3/celite, acetonitrile, reflux, 3 h; (b) NaIO4, MeOH, CCl4, pyridine, Al2O3, four outputs with 71%–82% yield.
