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A new synthesis of furo[3,4-b]quinolin-3(1H)-one derivatives has been established in straightforward fashion in high overall yields. An efficient Hendrickson reagent-initiated cascade annulation, which is composed of mild conversion of the stable amide precursor to the reactive imido-carbonium intermediate and subsequent intramolecular aza Diels-Alder reaction, successfully serves as the key reaction in the synthesis. Final oxidative cleavage of the carbon-carbon double bond of representative tricyclic precursor 8g led to completion of the synthesis of quinoline-lactone 2g in a high yield. 相似文献
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The combination of phenol and potassium hydroxide (KOH) was used to chemically recycle carbon fibre reinforced epoxy resin cured with 4,4′-diaminodiphenylmethane in subcritical water. This combination had a synergistic effect on decomposing this kind of epoxy resin. The main decomposition products from the epoxy resin were identified by means of GC-MS, and a possible free-radical reaction mechanism for the decomposition of epoxy resin is proposed. The recovered carbon fibres were characterized using single fibre tensile tests, scanning electron microscopy and X-ray photoelectron spectroscopy. Compared to virgin carbon fibres after sizing removal, the surface compositions of the recovered carbon fibres had little change and the tensile strength of the recovered carbon fibres was well retained. 相似文献
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