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Hydride hijacked by “hydrogen”! N-Alkylindoles and N-alkylindolines were obtained in the redox amination of indoline with aldehyde, which was tuned by a hydrogen-bond effect. Salicylaldehyde gave the indoline-type product via intermolecular hydride transfer, while other aromatic aldehydes gave the indole-type product via intramolecular hydride transfer.
Mao et al. (Thu,) studied this question.
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