Highly Selective Synthesis of Bicyclic Quinolizidine Alkaloids and Their Analogues via Double RCM Reaction of <i>N</i>-Alkynyl-<i>N</i>-(1,ω)-alkadienyl Acrylamides
作者:Shengming Ma、Bukuo Ni、Zhiqiang Liang
DOI:10.1021/jo0493121
日期:2004.9.1
alkaloid derivatives and their analogues bearing a 1,3-diene moiety, which may further undergo a Diels−Alder reaction with a dienophile to afford N-containing polycyclic compounds. The excellent selectivity of fused/dumbbell-mode cyclization has been realized by the higher reactivity of the electron-rich CC bond or carbon−carbon triple bond combined with the lower reactivity of the electron-deficient CC