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Regioselective Access to Structurally Diverse Coumarin Analogues through Iron-Catalysed Annulation Reactions
作者:Qiao Ren、Jie Kang、Muyao Li、Lujiang Yuan、Ruoyun Chen、Lei Wang
DOI:10.1002/ejoc.201700999
日期:2017.10.10
A highly efficient iron-catalysed propargylation/alkyne oxacyclization/isomerization strategy is described. Biologically active furo[3,2-c]coumarins and pyrano[3,2-c]coumarins are expeditiously assembled with high regioselectivities.
描述了一种高效的铁催化的炔丙基化/炔基羰基化/异构化策略。具有高区域选择性的生物活性呋喃[3,2- c ]香豆素和吡喃并[3,2- c ]香豆素被迅速组装。
Bi(OTf)3-catalyzed solvent-free synthesis of pyrano[3,2-c]coumarins through a tandem addition/annulation reaction between chalcones and 4-hydroxycoumarins
作者:Mukut Gohain、Johannes H. van Tonder、Barend C.B. Bezuidenhoudt
DOI:10.1016/j.tetlet.2013.05.008
日期:2013.7
A Bi(OTf)3-catalyzedtandemaddition/annulation reaction is described in order to synthesize pyrano[3,2-c]coumarins under solvent-free conditions. Substituted/unsubstituted chalcones were conveniently condensed with various 4-hydroxycoumarins by means of this environmentally benign method which produces water as the only side product.
描述了Bi(OTf)3催化的串联加成/环合反应,以便在无溶剂条件下合成吡喃并[3,2- c ]香豆素。借助于这种环境友好的方法,取代的/未取代的查耳酮方便地与各种4-羟基香豆素缩合,该方法产生水作为唯一的副产物。