Dual Catalysis: Combination of Photocatalytic Aerobic Oxidation and Metal Catalyzed Alkynylation Reactions-CC Bond Formation Using Visible Light
作者:Magnus Rueping、René M. Koenigs、Konstantin Poscharny、David C. Fabry、Daniele Leonori、Carlos Vila
DOI:10.1002/chem.201200050
日期:2012.4.23
Shedding new light on the right combination of catalysts: A new dual catalytic system for efficient CH functionalization was developed. The appropriate choice of two metal catalysts allows the oxidativealkynylation of tertiary amines under mild and sustainable reaction conditions.
Fast, solvent-free asymmetric alkynylation of prochiral sp3 C–H bonds in a ball mill for the preparation of optically active tetrahydroisoquinoline derivatives
作者:Jingbo Yu、Zhenhua Li、Kanyan Jia、Zhijiang Jiang、Menglu Liu、Weike Su
DOI:10.1016/j.tetlet.2013.02.007
日期:2013.4
Solvent-free asymmetric cross-dehydrogenative-coupling (CDC) reaction between the sp(3) C-H bond of prochiral CH2 and terminal alkynes was first studied under High-Speed Ball-Milling conditions. A series of optical active 1-alkynyl tetrahydroisoquinoline derivatives were achieved by using recoverable copper balls together with PyBox chiral ligand in the presence of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ). All coupling products were obtained in good yields at short reaction time with enantiomeric excesses up to 79%. (C) 2013 Elsevier Ltd. All rights reserved.