Copper-Catalyzed Synthesis of 1,2-Disubstituted Cyclopentanes from 1,6-Dienes by Ring-Closing Kharasch Addition of Carbon Tetrachloride
作者:José María Muñoz-Molina、Tomás R. Belderraín、Pedro J. Pérez
DOI:10.1002/adsc.200800364
日期:2008.10.6
The reaction of carbon tetrachloride (CCl4) with various 1,6-heptadienes catalyzed by copper homoscorpionate complexes affords cyclization products in moderate to high yields. The process involves the addition of the trichloromethyl radical to the diene followed by a 5-exo-trig cyclization reaction, resulting in the formation of the cis-3-chloromethyl-4-(2,2,2-trichloroethyl)cyclopentane isomers in
四氯化碳(CCl 4)与高碘酸铜配合物催化的各种1,6-庚二烯的反应可提供中等至高收率的环化产物。该方法包括将三氯甲基自由基加到二烯中,然后进行5 -exo-trig环化反应,从而在环戊烷中形成顺式-3-氯甲基-4-(2,2,2-三氯乙基)环戊烷异构体。高度区域特异性和立体特异性的方式。我们已经研究了使用镁(Mg)作为还原剂来再生铜(I)催化剂。即使在二烯丙基醚(DAE)和N,N-二烯丙基氨基甲酸酯叔丁酯(TBDAC)的情况下,该方法也提供了高收率的杂环。