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An organocatalytic method for the synthesis of some novel xanthene derivatives by the intramolecular Friedel–Crafts reaction

机译:分子内Friedel-Crafts反应合成某些新型x吨衍生物的有机催化方法

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An efficient organocatalytic method for the synthesis of new substituted 9-arylxanthenes (2a–2u) starting from diarylcarbinol compounds with an arenoxy group (1a–1u) has been developed using the intramolecular Friedel–Crafts reaction. The substrates were prepared in two steps by Ullmann-type coupling and then Grignard reaction. Some organic Br?nsted acids were studied as catalysts (3a–3g) in the intramolecular Friedel–Crafts alkylation reaction for the first time. N-triflylphosphoramide (3g) provided the synthesis of some novel substituted 9-arylxanthenes with excellent yields at room temperature within 15 minutes.
机译:利用分子内Friedel-Crafts反应,已经开发出一种有效的有机催化方法,用于从具有芳氧基(1a-1u)的二芳基甲醇化合物开始合成新的取代的9-芳基黄嘌呤(2a-2u)。通过Ullmann型偶联然后进行格氏反应分两步制备底物。首次在分子内Friedel-Crafts烷基化反应中研究了一些有机布朗斯台德酸作为催化剂(3a-3g)。 N -三氟磷酰胺(3g)可在室温下在15分钟内以优异的产率合成某些新颖的取代9-芳基黄嘌呤。

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