Diels-Alder reactions of fused pyran-2-ones with maleimides: efficient syntheses of benz[e]isoindoles and related systems.

作者: Krištof Kranjc , Slovenko Polanc , Marijan Kočevar

DOI: 10.1021/OL034852Q

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摘要: The Diels−Alder reaction of some substituted 5,6,7,8-tetrahydro-2H-1-benzopyran-2-ones (1a−f) with N-substituted maleimides (2a−c) leading to fused isoindole derivatives (5a−n, 7) or, in a few cases, bridged double cycloadducts (fused bicyclo[2.2.2]octene derivatives) (6a−f) is presented. When X = CO, the first efficient, substituent-driven aromatization an intermediary-formed cycloadduct was observed, resulting benz[e]isoindoles (5a−k). same type can also be achieved unprecedented catalysis Rh/C.

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