straightforward method for the synthesis of indolin-3-ones bearing a C2-quaternary functionality is reported. A series of 2,2-disubstituted indolin-3-ones were constructed in up to 94% yields in the absence of a metal catalyst. This cross-coupling reaction allows the facile synthesis of 2,2-disubstituted indolin-3-ones from readily available substrates in a short reaction time.
cross-dehydrogenative coupling of indoles with various C-H nucleophiles is developed. This process features a broad substrate scope with respect to both indoles and nucleophiles, affording structurally diverse 2,2-disubstituted indolin-3-ones in high yields (up to 99%). The oxidative dimerization and trimerization of indoles has also been demonstrated under the same conditions.