ABSTRACT An efficient and environmentally friendly protocol has been demonstrated for water-soluble (salicyladimine)2Cu complex-catalyzed Michaeladdition of indoles to nitroolefins in water at 30 °C. A variety of substituted indoles and β-nitrostyrenes could be worked well to provide the title products in 81–97% yields. Moreover, the catalyst can be reused directly at least for four times without
摘要 在 30 °C 下,水溶性(水杨酸二亚胺)2Cu 络合物催化吲哚与硝基烯烃迈克尔加成反应是一种高效且环保的方案。各种取代的吲哚和 β-硝基苯乙烯可以很好地工作,以 81-97% 的产率提供标题产品。此外,催化剂可以直接重复使用至少四次,而不会显着降低活性。图形概要
A combination of water and microwave irradiation promotes the catalyst-free addition of pyrroles and indoles to nitroalkenes
作者:Margherita De Rosa、Annunziata Soriente
DOI:10.1016/j.tet.2010.02.055
日期:2010.4
A combination of water and microwave irradiation was used for the first time to perform a catalyst-free nitro-Michael addition of pyrroles and indoles. Under superheated conditions, the water trends to ionize by changing its chemical and physical properties. Therefore, we performed a new green-protocol using the water either as environmentally no harm solvent or as catalyst. The reaction success is independent from the kind of pyrrole, indole or nitroalkenes rapidly affording the corresponding adducts and giving excellent yields. (C) 2010 Elsevier Ltd. All rights reserved.