Intramolecular 1,3-dipolar nitrone cycloaddition route to bicyclic fused enediyne
作者:Amit Basak、Subhash C. Ghosh
DOI:10.1016/j.tetlet.2005.08.125
日期:2005.10
Bicyclic isooxazolidinyl enediynes 1 and 2 have been prepared by intramolecular nitrone cycloaddition between the two arms of an acyclic enediyne precursor 13. The reaction is highly regioselective and the two configurational isomers have similar onset temperatures for BC indicating no influence of bridgehead stereochemistry on the kinetics of cyclization.
双环异恶唑烷二烯二烯1和2已通过无环烯二炔前体13的两个臂之间的分子内硝酮环加成制备。该反应是高度区域选择性的,并且两种构型异构体对于BC具有相似的起始温度,表明桥头立体化学对环化动力学没有影响。