Four- and Sixfold Tandem-Domino Reactions Leading to Dimeric Tetrasubstituted Alkenes Suitable as Molecular Switches
作者:Lutz F. Tietze、Bernd Waldecker、Dhandapani Ganapathy、Christoph Eichhorst、Thomas Lenzer、Kawon Oum、Sven O. Reichmann、Dietmar Stalke
DOI:10.1002/anie.201503538
日期:2015.8.24
A highly efficient palladium‐catalyzed fourfold tandem‐domino reaction consisting of two carbopalladation and two CH‐activation steps was developed for the synthesis of two types of tetrasubstitutedalkenes 3 and 6 with intrinsic helical chirality starting from substrates 1 and 4, respectively. A sixfold tandem‐domino reaction was also developed by including a Sonogashira reaction. 20 compounds with
作者:F. Marshall Beringer、Louis Kravetz、Geraldine B. Topliss
DOI:10.1021/jo01015a046
日期:1965.4
An Improved Synthesis of Dibenzofurans by a Free-Radical Cyclization
作者:Frederick W. Wassmundt、Ronald P. Pedemonte
DOI:10.1021/jo00121a016
日期:1995.8
Reaction conditions for the formation of dibenzofurans from diazotized o-(aryloxy)anilines have been examined. Several promoters (hydroquinone, SnCl2, NaI, CuSO4, FeSO4, etc.) have been discovered; these act as electron donors and promote a free-radical mechanism. The best of these is FeSO4 which shortens the reaction time from hours to minutes and contributes to high yields (77-83%). We have been able to transform the cyclization to a reliable and convenient synthesis.