Cascade Cyclization, Dipolar Cycloaddition to Bridged Tricyclic Amines Related to the <i>Daphniphyllum</i> Alkaloids
作者:Iain Coldham、Adam J. M. Burrell、Hélène D. S. Guerrand、Niall Oram
DOI:10.1021/ol102961x
日期:2011.3.18
A tandem one-pot reaction of an aldehyde with a primary amine involving condensation and then cyclization (N-alkylation), followed by intramolecular dipolar cycloaddition of the resulting nitrone or azomethine ylide, provides a synthesis of bridged tricyclic amines. The reaction was most successful using hydroxylamine, and when the dipolarophile was an unsaturated ester, subsequent reduction of the
醛与伯胺的串联一锅法反应包括缩合,然后环化(N-烷基化),然后分子内偶极环加成所得的硝酮或甲亚胺叶立德,合成了桥连的三环胺。使用羟胺反应最成功,当双极性亲和剂是不饱和酯时,N-O键的还原和内酰胺的环化提供了yuzurimine,daphnilactone B和bukittinggine型Daphniphyllum生物碱的核心环系统。