Rongalite (Na-HOCH2SO2·2H2O) is a useful and cheap industrial product which has been widely used in the dye,rubber,and veterinary industries.It is also used as a versatile reagent in synthetic chemistry1.The most common uses of rongalite are (i) as a source of SO2-anions for the preparation of sulfones and sultines;(ii) as a promoter of SET reactions;(iii) as a reduction system in combination with tellurium.In our research process,we found that rongalite could be employed as an HCHO source,which could act as a C1 unit to participate in subsequent transformations.Furans constitute one of the most common and important classes of heterocycles2.They exhibit a range of pharmaceutical activities and present as key structural units in many natural products3.They have also been used as basic building blocks in synthetic chemistry and materials science;as a consequence,considerable research has been devoted to constructing polysubstituted furans.Herein,we report I2/Cu(NO3)2·3H2O mediated triple C(sp3)-H bond functionalization reaction of aryl methyl ketones and rongalite for the convenient construction of the furan skeleton by employing rongalite as a C1 unit.