Asymmetric Total Syntheses of (−)-Penicipyrone and (−)-Tenuipyrone via Biomimetic Cascade Intermolecular Michael Addition/Cycloketalization
作者:Liyan Song、Hongliang Yao、Liangyu Zhu、Rongbiao Tong
DOI:10.1021/ol303071t
日期:2013.1.4
of (−)-penicipyrone and (−)-tenuipyrone were accomplished enantioselectively in 12 steps with an 11% yield and 6 steps with a 28% yield from the known 4-((tert-butyldimethylsilyl)oxy)-cyclopent-2-enone, respectively, by developing a biomimetic bimolecular cascade cyclization featuring an intermolecular Michael addition/cyclo-(spiro-)ketalization sequence. The relative, absolute stereochemistry and
(-)-penicipyrone和(-)-tenuipyrone的第一批总合成是从已知的4-((叔丁基二甲基甲硅烷基)氧基)环戊烯中以12步对映体选择性完成的,产率为11%,6步以28%的产率完成通过开发仿生双分子级联环化反应以分子间迈克尔加成/环-(螺-)缩酮化序列为代表的-2-烯酮。通过X射线晶体学分析和旋光度的比较进一步证实了哌替吡隆的相对,绝对立体化学和碳连接性。