Lewis Acid Catalyzed Cascade Reactions of Diarylvinylidenecyclopropanes and 1,1,3-Triarylprop-2-yn-1-ols or Their Methyl Ethers
作者:Min Shi、Liang-Feng Yao
DOI:10.1002/chem.200800421
日期:2008.9.26
The reactions of vinylidenecyclopropanes 1 with 1,1,3-triarylprop-2-yn-1-ols or their methyl ethers 2 in the presence of a Lewis acid selectively produce 4-dihydro-1H-cyclopenta[b]naphthalene derivatives 3 or 1,2,3,8-tetrahydrocyclopenta[a]indene derivatives 4 depending on the substituents on the cyclopropane. Good to high yields are obtained under mild conditions. A plausible cascade Meyer-Schuster
亚乙烯基环丙烷1与1,1,3-三芳基丙-2-炔-1-醇或其甲基醚2在路易斯酸存在下的反应选择性地产生4-二氢-1H-环戊[b]萘衍生物3或1取决于环丙烷上的取代基,, 2,3,8-四氢环戊[a]茚衍生物4。在温和的条件下可获得良好至高产。提出了一种可能的级联Meyer-Schuster重排和Friedel-Crafts反应机理。此外,当将强供电电子的甲氧基基团引入2的苯环中时,在相似的条件下也可以以中等至良好的产率获得新型的官能化的亚甲基环丁烯衍生物5。