Lewis acid mediated cascade reactions of silyl-substituted methylenecyclopropyl ketones
作者:Guillaume L.N Peron、John Kitteringham、Jeremy D Kilburn
DOI:10.1016/s0040-4039(99)02342-4
日期:2000.3
cyclisation of various silyl-substituted methylenecyclopropylketones has been investigated. The presence of the silyl-substituent enhances the reactivity of the methylene cyclopropane in comparison to our earlier study on non-silyl-substituted methylenecyclopropylketones, allowing milder Lewis acids (BF3·Et2O or BF3·2AcOH) to be used for the cyclisation reaction. The mild conditions used allow the allyl
Samarium diiodide mediated 6-exo cyclisations of methylenecyclopropyl ketones
作者:Jonathan J. Underwood、Gregory J. Hollingworth、Peter N. Horton、Michael B. Hursthouse、Jeremy D. Kilburn
DOI:10.1016/j.tetlet.2003.12.156
日期:2004.3
6-exo Cyclisations of methylenecyclopropyl ketones, mediated by samariumdiiodide, have been investigated with a series of substrates. The efficiency of the cyclisations are highly dependent on the stereochemistry of the cyclisation precursor.