One-Pot Synthesis of Symmetrical and Unsymmetrical Bisarylethynes by a Modification of the Sonogashira Coupling Reaction
作者:Matthew J. Mio、Lucas C. Kopel、Julia B. Braun、Tendai L. Gadzikwa、Kami L. Hull、Ronald G. Brisbois、Christopher J. Markworth、Paul A. Grieco
DOI:10.1021/ol026266n
日期:2002.9.1
A modification of the Sonogoshira coupling reaction employing an amidine base and a substoichiometric amount of water generates symmetrical and unsymmetrical bisarylethynylenes in one pot through in situ deprotection of trimethylsilylethynylene-added intermediates.
A Synthesis of Conjugatively Bridged Bis- and Tris-5-(2,2‘-Bipyridines): Multitopic Metal Ion-Binding Modules for Supramolecular Nanoengineering
作者:P. N. W. Baxter
DOI:10.1021/jo990665n
日期:2000.3.1
(5d,e) to ensure completion of the Stille cross-couplingreactions. The Stille cross-couplings showed a marked substituent effect in which the terminally phenylated bis- and tris-5-(2,2'-bipyridines) were formed in higher yields than the methyl-substituted analogues with the same bridge. The advantages of the methodology lie in its synthetic convenience and adaptibility for creating multitopic metal
A series of bispyridines and bispyrimidines 1a, 1b, 1c, 1d, 1e showing the heterocycles attached to both ends of an ethynylene unit and being α‐substituted with chloro, tert‐butylthio, and methoxy groups have been synthesized via cross‐coupling technique and their crystal structures studied by X‐ray diffraction analysis. Supramolecular interactions of C–H···N and π···π stacking type were found to largely