Diels−Alder Reactions of Fused Pyran-2-ones with Maleimides: Efficient Syntheses of Benz[<i>e</i>]isoindoles and Related Systems
作者:Krištof Kranjc、Slovenko Polanc、Marijan Kočevar
DOI:10.1021/ol034852q
日期:2003.8.1
N-substituted maleimides (2a-c) leading to fused isoindole derivatives (5a-n, 7) or, in a few cases, to bridged double cycloadducts (fused bicyclo[2.2.2]octene derivatives) (6a-f) is presented. When X = CO, the first efficient, substituent-driven aromatization of an intermediary-formed cycloadduct was observed, resulting in substituted benz[e]isoindoles (5a-k). The same type of aromatization can also
AbstractEthyl vinyl ether was found to be an appropriate synthetic equivalent of acetylene for a set of Diels–Alderreactions with fused pyran-2-ones that yield fused carbocyclic systems. Transformations were conducted under microwave irradiation with DABCO (as a catalyst for the elimination of ethanol) and with n-butanol as the additive. A single-crystal X-ray diffraction structure is presented for