Lewis-Acid-Catalyzed Reactions of Bis(4-alkoxyphenyl)methanol with (Diarylmethylene)- and (Dialkylmethylene)cyclopropanes
作者:Liang-Feng Yao、Min Shi
DOI:10.1002/ejoc.200900546
日期:2009.10
Bis(4-methoxyphenyl)methanol (2a) can be transformed by BF3·OEt2-catalyzed reactions of (arylmethylene)cyclopropanes 1 to the corresponding polysubstituted cyclopentenes 3 as the major products along with methylenecyclobutanes and dienes as minor products. The reaction conditions are mild, yields are moderate to good. In the reactions of aliphatic methylenecyclopropanes with bis(4-methoxyphenyl)methanol (2a), cyclopentenes
双(4-甲氧基苯基)甲醇(2a)可以通过(芳基亚甲基)环丙烷 1 的 BF3·OEt2 催化反应转化为相应的多取代环戊烯 3 作为主要产物以及亚甲基环丁烷和二烯作为次要产物。反应条件温和,收率中等至良好。在脂肪族亚甲基环丙烷与双(4-甲氧基苯基)甲醇(2a)的反应中,在标准条件下以良好的产率生产了环戊烯 3o-q。从 1-[环亚丙基(4-甲氧基苯基)甲基]-4-甲氧基苯(1e)与双(4-烷氧基苯基)甲醇 2 的反应中获得了有趣的结果:在温和的反应条件下以良好的产率获得了多取代的环戊烯衍生物 5。提出了基于氘标记和控制实验的合理反应机制。