Abstract
AbstractA photoinduced palladium-catalyzed cascade reaction involving remote C(sp3)–H functionalization and intramolecular Tsuji–Trost annulation is developed. The reaction is proposed to proceed through a sequence involving the amidyl radical generation, 1,5-HAT-mediated alkyl radical formation, and subsequent difunctionalization of 1,3-dienes. Without the use of exogeneous photosensitizers and external oxidants, the reaction provided an efficient approach to multi-substituted chiral piperidines in high yields, employing readily available chiral amino acid derivatives and 1,3-dienes as the substrates. In most cases, the syn/anti ratio of the product could be further improved by treatment with catalytic amount of iron salt.
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