Friedländer annulation: scope and limitations of metal salt Lewis acid catalysts in selectivity control for the synthesis of functionalised quinolines
作者:Babita Tanwar、Dinesh Kumar、Asim Kumar、Md. Imam Ansari、Mohammad Mohsin Qadri、Maulikkumar D. Vaja、Madhulika Singh、Asit K. Chakraborti
DOI:10.1039/c5nj02010g
日期:——
products during the reaction involving 2-aminobenzophenone and ethyl acetoacetate. Among a pool of metal halides, tetrafluoroborates, perchlorates, and triflates used as catalysts, In(OTf)3 emerged as the most effective catalyst for the selective/exclusive formation of the Friedländer product. The generality of the In(OTf)3-catalysed Friedländer reaction was demonstrated by the reaction of differently substituted
检查了金属盐路易斯酸催化剂的范围和局限性,以控制在涉及2-氨基二苯甲酮和乙酰乙酸乙酯的反应过程中弗里德兰德和非弗里德兰德产品形成的选择性。在用作催化剂的一系列金属卤化物,四氟硼酸盐,高氯酸盐和三氟甲磺酸盐中,In(OTf)3成为选择性/排他地形成弗里德兰德产品的最有效催化剂。In(OTf)3催化的Friedländer反应的普遍性通过不同取代的2-氨基芳基酮与各种含有活性亚甲基的羰基化合物(例如,,无溶剂条件下的β-酮酸酯,环状/无环β-二酮,环状/酰基酮和芳基/杂芳基甲基酮),以75-92%的收率提供所需的喹啉。