Abstract
A novel visible-light promoted radical cyclization reaction of 3-indolylallylamides with sulfonyl chlorides as coupling partners has been described, which provides a unique approach toward the synthesis of functionalized tetrahydrocarbolinones. This reaction involves the reduction of sulfonyl chlorides to sulfonyl radicals, addition of sulfonyl radicals to alkenyl moiety, and following cycloaddition to indolyl at the C2 position. This photocatalytic reaction tolerates a broad range of aryl and alkyl sulfonyl chlorides with diverse functional groups, which provides a direct and operationally simple protocol to construct functionalized tetrahydrocarbolinones.
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