Synthesis of 1,2,3,4-Tetramethyl- and 1,2,3,4-Tetraethylfluorene through a Dewar Benzene Pathway
作者:Štěpánka Janková、Jiří Schulz、Simona Hybelbauerová、Ivana Císařová、Petr Štěpnička、Martin Kotora
DOI:10.1002/ejoc.201201343
日期:2013.1
-fluorenes was achieved by using Dewar benzenes as important intermediates. The corresponding Dewar benzenes were prepared by reactions of tetraalkylcyclobutadiene–AlCl3 complexes with methyl phenylpropynoate. Their subsequent hydrolysis followed by photochemical rearrangement provided substituted biphenylcarboxylic acids. Treatment of the prepared acids with thionyl chloride gave rise to the fluorenones
通过使用杜瓦苯作为重要的中间体,实现了 1,2,3,4-四 (m) 乙基芴酮和 - 芴的简单和选择性合成。相应的杜瓦苯是通过四烷基环丁二烯-AlCl3 配合物与苯丙酸甲酯反应制备的。它们随后的水解和光化学重排提供了取代的联苯羧酸。用亚硫酰氯处理制备的酸产生芴酮,其被还原为相应的芴。制备了具有 1,2,3,4-四乙基芴酮的 Ru 络合物。