Facile and selective formation of a linear-triquinane skeleton by a rationally designed round trip radical reaction
作者:Kiyosei Takasu、Soumen Maiti、Akira Katsumata、Masataka Ihara
DOI:10.1016/s0040-4039(01)00107-1
日期:2001.3
The radical reaction of 1-iodo-1,5,10-trienoate afforded a linear fused five-membered carbocycle. Another key feature of this reaction is the remarkable acceleration of the reaction rate and enhancement of selectivity caused by the introduction of a conjugated ester moiety at the terminal olefin. This cascade reaction proceeds through three sequential 5-exo cyclizations. The result is in stark contrast
1-碘-1,5,10-三烯酸酯的自由基反应得到线性稠合的五元碳环。该反应的另一个关键特征是由于在末端烯烃处引入共轭酯部分而引起的反应速度的显着加快和选择性的提高。该级联反应通过三个连续的5- exo环化进行。结果与先前报道的1-iodo-1,5,9,14-tetraenoate的自由基反应形成鲜明对比,后者通过6-内,6--内,6- exo环化反应生成线性稠合的六元碳环。