A one-pot electronically controlled [4 + 2] cycloaddition reaction of in situ generated benzyne with 2-arylidene-1-indenone is unveiled to construct novel spirocyclic frameworks in a regio- and diastereoselective fashion. This protocol features operational simplicity, good functional group tolerance and avoids the use of metal catalysts and external additives. This methodology has extended the synthetic
揭示了原位生成的苯与 2-亚芳基-1-茚酮的单锅电子控制 [4 + 2] 环加成反应,以区域和非对映选择性方式构建新型螺环框架。该协议具有操作简单、良好的官能团耐受性并避免使用金属催化剂和外部添加剂的特点。这种方法扩展了 2-arylidene-1-indenones 的合成应用,可以轻松获得有价值的 10' H -spiro[indene-2,9'-phenanthren]-1(3 H )-ones 并获得高产率。
One-pot inter- and intramolecular Friedel–Crafts reactions in Baylis–Hillman chemistry: a novel facile synthesis of ( E )-2-arylideneindan-1-ones
作者:Deevi Basavaiah、Ravi Mallikarjuna Reddy
DOI:10.1016/s0040-4039(01)00354-9
日期:2001.4
A simple one-pot stereoselective transformation of tert-butyl 3-aryl-3-hydroxy-2-methylenepropanoates, the Baylis–Hillman adducts obtained from t-butyl acrylate, into (E)-2-arylideneindan-1-ones involving one inter- and one intramolecular Friedel–Crafts reaction is described.