which are bioactive marine diterpenes containing a serrulatane or amphilectane skeleton, was elaborated. The chirogenic step, i.e. a Cu(I)-catalyzed allylic alkylation of a cinnamyl chloride with methylmagnesium bromide, proceeded with virtually complete enantioselectivity (99% ee) in the presence of a chiral phosphine-phosphite ligand. The other stereocenters were diastereoselectively established through
阐述了短促和对映体选择性合成Helioporins C和E的方法,Helioporins C和E是一种
生物活性的海洋二
萜类化合物,其中含有Serrulatane或Amphilectane骨架。在手性膦-
亚磷酸酯
配体的存在下,手性步骤,即
肉桂基氯与
甲基溴化镁的Cu(I)催化的烯丙基烷基化反应,以几乎完全对映选择性(99%ee)进行。其他立体中心是通过Me 2 AlCl介导的阳离子环化和Ir催化的氢化非对映选择性地建立的。