Short, Enantioselective Total Synthesis of Sceptrin and Ageliferin by Programmed Oxaquadricyclane Fragmentation
作者:Phil S. Baran、Ke Li、Daniel P. O'Malley、Christos Mitsos
DOI:10.1002/anie.200503374
日期:2006.1
Total Synthesis of Dimeric Pyrrole−Imidazole Alkaloids: Sceptrin, Ageliferin, Nagelamide E, Oxysceptrin, Nakamuric Acid, and the Axinellamine Carbon Skeleton
作者:Daniel P. O'Malley、Ke Li、Michael Maue、Alexandros L. Zografos、Phil S. Baran
DOI:10.1021/ja069035a
日期:2007.4.1
the first total syntheses of several members of this family, including sceptrin, ageliferin, nagelamide E, nakamuric acid (and its methyl ester), and oxysceptrin. Details on the fascinating conversion of sceptrin to ageliferin, which has been used to produce gram quantities of this sensitive natural product, are provided. In addition, the first enantioselectivetotalsynthesis of sceptrin and ageliferin
Sceptrin - Enantioselective Synthesis of a Tetrasubstituted all-<i>trans</i>
Cyclobutane Key Intermediate
作者:Lena Barra、Jeroen S. Dickschat
DOI:10.1002/ejoc.201700882
日期:2017.8.24
asymmetric synthesis of both enantiomers of tetrasubstituted all-trans dimethyl 3,4-diacetylcyclobutane-1,2-dicarboxylate with high enantiomeric purity (>98 % ee) using a valine-derived chiral auxiliary in a diastereoselective photodimerization is reported. The absolute configuration was assigned by single-crystal X-ray diffraction analysis. Because this cyclobutane is a keyintermediate in the total
报道了使用缬氨酸衍生的手性助剂在非对映选择性光二聚反应中不对称合成具有高对映体纯度 (>98% ee) 的四取代全反式二甲基 3,4-二乙酰环丁烷-1,2-二羧酸酯的两种对映异构体。通过单晶 X 射线衍射分析指定绝对构型。因为这种环丁烷是 (-)-sceptrin 和ageliferin 全合成的关键中间体,我们的研究结果加强了最近修订的这些吡咯-咪唑生物碱的绝对构型。