Functionalized buta-1,3-diynyl- N -methylpyrazoles by sequential “diacetylene zipper” and Sonogashira coupling reactions
作者:Anastasiya I. Govdi、Alexandra E. Kulyashova、Sergey F. Vasilevsky、Irina A. Balova
DOI:10.1016/j.tetlet.2017.01.032
日期:2017.2
A reaction sequence consisting of the “Diacetylene zipper” of buta-1,3-diynes from internal to terminal isomers, followed by Sonogashiracross-coupling with 3-,4- or 5-iodopyrazoles, was investigated as a new approach to buta-1,3-diynyl-N-methylpyrazoles. Various pyrazoles bearing alkyl and hydroxyalkyl containing buta-1,3-diyne substituents in the 3-,4- or 5-position and functional groups at the neighboring
An acetylene zipper—Sonogashira reaction sequence for the efficient synthesis of conjugated arylalkadiynols
作者:Alexandra E. Kulyashova、Viktor N. Sorokoumov、Vladimir V. Popik、Irina A. Balova
DOI:10.1016/j.tetlet.2013.02.066
日期:2013.5
We describe a new approach to the preparation of unsymmetrical arylalkadiynols, which is based on the isomerization of readily available internal alkadiynols into their terminal isomers followed by Sonogashira cross-coupling. The influence of the reaction conditions on the efficiency of the 'acetylene zipper' of alkadiynols is investigated. Unstable terminal diynols are used without isolation in Pd/Cu-catalyzed cross-couplings with iodoarenes bearing either electron-withdrawing or electron-donating substituents. (C) 2013 Elsevier Ltd. All rights reserved.