Synthesis of Naphthylpyridines from Unsymmetrical Naphthylheptadiynes and the Configurational Stability of the Biaryl Axis
作者:Fabian Fischer、Alexander F. Siegle、Marek Checinski、Christine Fischer、Karolin Kral、Richard Thede、Oliver Trapp、Marko Hapke
DOI:10.1021/acs.joc.5b02190
日期:2016.4.15
cycloaddition reaction between the corresponding naphthyldiyne and aceto- or benzonitrile. The heterobiaryl products have been isolated and investigated with respect to the configurational stability of their biaryl axis using dynamic chiral HPLC; subtle effects of the substitution pattern on the stability of the axis were observed. For several compounds the activation barriers (ΔG‡) of racemization were determined
Investigations on the synthesis of monoarylated diynes by monoprotection/cross-coupling/deprotection approach
作者:Karolin Kral、Marko Hapke
DOI:10.1016/j.tetlet.2012.03.118
日期:2012.6
The presented experimental work investigates the usefulness of temporary monoprotection of symmetrical terminal diynes in the coupling with aryl iodides. The monoprotection/cross-coupling/deprotection approach proved to be efficient for the coupling of diynes with aryl substrates avoiding the formation of diarylated byproducts. The high importance of the ratio of solvents in the Sonogashira coupling