Selective Lewis Acid Catalyzed Transformation (γ-Butyrolactone versus Cyclopropane) of 2-Methoxy-4-benzyltetrahydrofuran Derivatives. Efficient Synthesis of Lignan Lactones
作者:Laurent Ferrié,、Didier Bouyssi、Geneviève Balme
DOI:10.1021/ol050690h
日期:2005.7.1
[reaction: see text]. A short synthesis of lactone lignans exploiting a three-componentcoupling strategy is presented using a new Lewisacidcatalyzed ring-opening/cyclization reaction of 2-methoxytetrahydrofuran derivatives 4 leading to gamma-butyrolactones as a key step. By simply changing the reaction conditions, it was possible, from the same substrates 4, to obtain selectively cyclopropane derivatives