Divergent Asymmetric Total Synthesis of (+)-Vincadifformine, (−)-Quebrachamine, (+)-Aspidospermidine, (−)-Aspidospermine, (−)-Pyrifolidine, and Related Natural Products
作者:Nengzhong Wang、Shuo Du、Dong Li、Xuefeng Jiang
DOI:10.1021/acs.orglett.7b01292
日期:2017.6.16
uniformly strategic total synthesis of Aspidosperma alkaloids (+)-vincadifformine, (−)-quebrachamine, (+)-aspidospermidine, (−)-aspidospermine, (−)-pyrifolidine, and nine others from efficiently constructed tricyclic ketone 13 is reported. Highlights of these divergent and practical syntheses include (i) stereoselective intermolecular [4 + 2] cycloaddition to establish a C–E ring with one all-carbon quaternary
据报道,从有效构建的三环酮13中均匀地战略合成了曲霉属生物碱(+)-长春藤碱,(-)-quebrachamine,(+)-aspidospermidine,(-)-aspidospermine,(-)-pyrifolidine和其他9种化合物。这些不同而实用的合成方法的重点包括:(i)立体选择性分子间[4 + 2]环加成反应,以建立具有一个全碳四元立体中心(C-5)和两个桥接的连续顺式-立体中心(C-12和C-19),(ii)Pd / C催化的氢化/脱保护/酰胺化级联过程以组装D环,以及(iii)Fischer吲哚化以锻造A–B环。