Wenzler Marta E, Melancon Bruce J, Sulikowski Gary A
Department of Chemistry, Institute of Chemical Biology, Vanderbilt University, Nashville, TN 77842-3012, USA.
Tetrahedron Lett. 2016 Jul 27;57(30):3252-3253. doi: 10.1016/j.tetlet.2016.05.102. Epub 2016 Jun 7.
A second-generation approach to the BC spirocycle of 'upenamide is reported. Central to the synthesis is an endo selective Diels-Alder reaction between 1-(-butyldimethylsiloxy)-1,3-butadiene and bromomaleic anhydride followed by a radical mediated allylation of the ring fusion bromide. Functional group manipulation provides three (-) advanced synthetic intermediates ready for coupling with the remaining half (DE bicycle) of 'upenamide.
报道了一种用于合成乌苯美司BC螺环的第二代方法。合成的关键是1-(叔丁基二甲基硅氧基)-1,3-丁二烯与溴代马来酸酐之间的内型选择性狄尔斯-阿尔德反应,随后是环稠合溴化物的自由基介导烯丙基化反应。官能团操作提供了三种(-)高级合成中间体,可用于与乌苯美司的其余半部分(DE双环)偶联。