Highly Diastereoselective [3+2] Cyclopenta[b]annulation of Indoles with2-Arylcyclopropyl Ketones and Diesters
作者:Chelvam Venkatesh、Prabal P. Singh、Hiriyakkanavar Ila、Hiriyakkanavar Junjappa
DOI:10.1002/ejoc.200600342
日期:2006.12
A highly diastereoselective Lewis acid (BF3·Et2O or TiCl4) induced [3+2] cycloaddition of substituted and unsubstituted indoles with 2-arylcyclopropyl ketones/diesters yielding cyclopenta[b]indoles in high yields is reported. This methodology has also been extended to tetrahydrocarbazole, cyclopenta[b]- and cyclohepta[b]indoles affording tetracyclic propellane type frameworks in modest yields. (© Wiley-VCH
据报道,一种高度非对映选择性的路易斯酸(BF3·Et2O 或 TiCl4)诱导取代和未取代吲哚与 2-芳基环丙基酮/二酯的 [3+2] 环加成反应,以高产率得到环戊并 [b] 吲哚。这种方法也已扩展到四氢咔唑、环戊 [b]- 和环庚 [b] 吲哚,以中等产率提供四环推进烷型骨架。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)