Direct Conjugate Addition of Alkynes with α,β-Unsaturated Carbonyl Compounds Catalyzed by NCN-Pincer Ru Complexes
作者:Jun-ichi Ito、Kohei Fujii、Hisao Nishiyama
DOI:10.1002/chem.201203380
日期:2013.1.7
the direct conjugate additions of α,β‐unsaturatedcarbonylcompounds, including ketones, esters, and amides, as well as vinylphosphonates, giving various β‐alkynyl carbonyl and phosphonate compounds. A bis(oxazolinyl)phenyl (phebox)–Ru complex also catalyzes the asymmetric conjugate addition of an alkyne with a β‐substituted, α,β‐unsaturated ketone to produce a chiral β‐alkynyl ketone.
opening/alkynylation of cyclopropanol by employing inexpensive and commercially available terminal alkyne is developed. The reactions proceeded efficiently to afford synthetically useful alk-4-yn-1-ones in moderate to good yields with good functional group tolerance. Control experiments showed that the reaction presumably proceeds via the formation of intermediates of copper homoenolate and/or alkynylcopper
Synthesis of Isoindole Derivatives by Palladium-Catalyzed Domino Reaction of (2-Alkynyl)phenylketone O-Pentafluorobenzoyloximes
作者:Mitsuru Kitamura、Yohei Moriyasu、Tatsuo Okauchi
DOI:10.1055/s-0030-1259556
日期:2011.3
Isoindole derivatives were synthesized by the palladium-catalyzed cyclization of (2-alkynyl)phenylketone O-pentafluorobenzoyloximes in the presence of organometallic compounds such as sodium formate and aryl boronic acid.
with alkyl acrylates proceeds in the presence of a catalytic amount of Ru3(CO)12 and lithium iodide to give the corresponding conjugate dienes. These two different types of catalytic carbon-carbon bondforming reactions are controlled only by the nature of halide ions, either a chloride or an iodide, with other conditions being kept almost the same.
Silver-Promoted Oxidative Ring Opening/Alkynylation of Cyclopropanols: Facile Synthesis of 4-Yn-1-ones
作者:Ye-Xiang Xie、Jin-Heng Li、Cheng-Yong Wang、Ren-Jie Song
DOI:10.1055/s-0035-1560374
日期:——
silver-promoted oxidative ringopening/alkynylation of cyclopropanols with ethynylbenziodoxolones (EBX) is described. This method enables the formation of alkylated alkynes via a sequence of ringopening and alkynylation. Control experiments support a radical mechanism in this silver-promoted method. A new silver-promoted oxidative ringopening/alkynylation of cyclopropanols with ethynylbenziodoxolones