A synthetic route to (+/-)-aurantioclavine has been established using a six-step transformation without toxic metal reagents. This synthetic route is useful because it is not only a short-step synthesis but is applicable to gram-scale synthesis of a protected (+/-)-aurantioclavine.
Remote Ester Groups Switch Selectivity: Diastereodivergent Synthesis of Tetracyclic Spiroindolines
作者:Jun Zhu、Yong Liang、Lijia Wang、Zhong-Bo Zheng、K. N. Houk、Yong Tang
DOI:10.1021/ja503117q
日期:2014.5.14
Stereocontrol in the synthesis of structurally complex molecules, especially those with all-carbon quaternary stereocenters, remains a challenge. Here, we reported the preparation of a class of tetracyclic cyclopenta-fused spiroindoline skeletons through Cu(II)-catalyzed intramolecular [3 + 2] annulation reactions of donor-acceptorcyclopropanes with indoles. Both cis- and trans-diastereomers of tetracyclic