Unexpected Dramatic Substituent Effect for Tuning the Selectivity in the Double Ring-Closing Metathesis Reaction of N-Containing Tetraenes. An Efficient Synthesis of Bicyclic Izidine Alkaloid Skeletons
作者:Shengming Ma、Bukuo Ni
DOI:10.1021/ol0172673
日期:2002.2.1
[reaction: see text] A doublering-closingmetathesisreaction for the efficientconstruction of the fused bicyclic izidine alkaloidskeleton was developed. In this reaction, high selectivity was realized by tuning of electronic and steric effects of substituents in the N-containing tetraenes. It was observed that the reactivity of electron-rich carbon-carbon double bonds is higher than that of electron-deficient