A metal-free, hypervalent iodine(III)-induced tandem oxidative cycloisomerization based process for preparation of fluorescent diethyl 5,5′-diaryl-2,2′-bifuran-4,4′-dicarboxylates
作者:Mei-Huey Lin、Tsung-Jung Yang
DOI:10.1016/j.tet.2018.10.069
日期:2018.12
method has been developed for concise synthesis of diethyl 5,5′-diaryl-2,2′-bifuran-4,4′-dicarboxylates. The preparative pathway begins with bis-C-alkylation reaction of the β-ketoester and 1,4-dibromobut-2-yne followed by hypervalent iodine (III)-mediated oxidative cycloisomerization reaction of the formed symmetric γ-alkynyl-diketones. The novel diethyl 5,5′-diaryl-2,2′-bifuran-4,4′-dicarboxylates
已经开发出一种新的方法,用于简明合成5,5'-二芳基-2,2'-联呋喃-4,4'-二羧酸二乙酯。制备途径从β-酮酸酯和1,4-二溴丁-2-炔的双C-烷基化反应开始,然后是形成的对称γ-炔基-二酮的高价碘(III)介导的氧化环异构化反应。发现通过使用该方法形成的新型5,5'-二芳基-2,2'-联呋喃-4,4'-二羧酸二乙酯具有独特的荧光性质。