Intramolecular 1,3-Dipolar Cycloaddition-Mediated Stereoselective Synthesis of Disubstituted Cyclopentane: A Simple Model for the Cyclopentane Ring System of Polycyclic Oroidine Alkaloids
作者:Yusuke Fukahori、Yohei Takayama、Takuya Imaoka、Osamu Iwamoto、Kazuo Nagasawa
DOI:10.1002/asia.201200820
日期:2013.1
diastereoselective synthesis of disubstituted cyclopentane 8 having a nitrogen‐containing quaternary carbon center, which is found in axinellamine A (5) and related compounds. During this work, we found that the 1,3‐dipolar cycloaddition product 24 immediately underwent intramolecular redox reaction at the newly formed morpholin‐2‐one moiety, thus affording disubstituted cyclopentane containing a tertiary
我们提出了具有氨基氮的季碳中心的二取代环戊烷8的非对映选择性合成,该化合物存在于乙酰氨基胺A(5)和相关化合物中。在这项工作中,我们发现1,3-偶极环加成产物24立即在新形成的吗啉-2-一部分发生分子内氧化还原反应,从而以良好的收率选择性地提供了含有叔胺(9)的二取代环戊烷。通过亚胺阳离子-烯胺异构化,胺9被成功地转化为胍31,它对应于8。