Dramatic influence of the substitution of alkylidene-5H-furan-2-ones in Diels–Alder cycloadditions with o-quinonedimethide as diene partner: en route to the CDEF polycyclic ring system of lactonamycin
作者:Sébastien Dubois、Fabien Rodier、Romain Blanc、Raphaël Rahmani、Virginie Héran、Jérôme Thibonnet、Laurent Commeiras、Jean-Luc Parrain
DOI:10.1039/c2ob25299f
日期:——
An efficient and rapid synthesis of the CDEF ring system of lactonamycinone is reported via a highly chemo- and diastereoselective intermolecular Diels–Alder cycloaddition between trans-1,2-disilyloxybenzocyclobutene and the appropriate γ-alkylidenebutenolide. The feasibility and the total chemoselectivity of the [4 + 2] cycloaddition for the construction of a spirolactone moiety via an intramolecular
lactonamycinone的CDEF环系统的高效且快速的合成报道经由之间的高度化疗和非对映选择性的分子间狄尔斯-阿尔德环加成反式-1,2- disilyloxybenzocyclobutene和适当的γ-alkylidenebutenolide。还介绍了使用两个分子通过分子内方法(IMDA)构建螺内酯部分的[4 + 2]环加成反应的可行性和总化学选择性,证明了γ-亚烷基丁烯内酯结构单元的多功能性。