Catalytic iron-mediated ene carbocyclizations: formal [4+4]-ene reactions of triene esters
作者:James M. Takacs、Peter W. Newsome、Cynthia Kuehn、Fusao Takusagawa
DOI:10.1016/s0040-4020(01)87749-8
日期:1990.1
2-Substituted-2,7,9-decatrienoates undergo an iron-catalyzed carbocyclization to yield trans-disubstituted cyclopentanes in moderate-to-good chemical yields. The cyclization products are formally the result of a [4+4]-ene reaction in which cis-propenyl and 2-acroyl functionalities are introduced as appendages to the newly formed cyclopentane ring by the cyclization. Triene ester substrates bearing
2-取代的2,7,9-十碳三烯酸酯经历铁催化的碳环化反应,以中等至良好的化学产率生成反式-二取代的环戊烷。环化产物形式上是[4 + 4]-烯反应的结果,其中通过环化将顺式丙烯基和2-丙烯酰基官能团作为附件引入到新形成的环戊烷环上。在4或6位带有烷基取代基的三烯酯底物以较高的1,2-立体诱导环化,生成三取代的环戊烷,其中三个连续的立体中心之间的相对立体化学受到控制。