Abstract
AbstractA convenient and efficient three‐component transformation of 2‐alkynyl arylazides, aryldiazonium tetrafluoroborates and sodium metabisulfite has been developed under mild and transition‐metal‐free conditions. Sodium metabisulfite which is cheap, easily available and abundant in nature is successfully utilized as SO2 surrogate, leading to a series of 3‐sulfonylindole derivatives in moderate to good yields. Cascade radical addition/cyclization was involved in this protocol with the formation of two C−S bonds and one C−N bond in one‐pot.
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