General Zinc-Catalyzed Conia-Ene Reactions of 1,3-Dicarbonyl Compounds with Alkynes Including the Classically Challenging Substrates under Neat Conditions
作者:Chen-Liang Deng、Ren-Jie Song、Yi-Lin Liu、Jin-Heng Li
DOI:10.1002/adsc.200900588
日期:2009.12
products has been developed by zinc-catalyzed intramolecular Conia-enereactions of 1,3-dicarbonylcompounds with alkynes. This new route allows a wide range of dicarbonyl compounds, including the classicallychallenging 1,3-diesters and N,N′-disubstituted 1,3-keto amides, to be used for the Conia-enereaction with inexpensive zinc chloride (ZnCl2) underneatconditions.
作者:Pablo Barrio、Manish Kumar、Zhichao Lu、Junbin Han、Bo Xu、Gerald B. Hammond
DOI:10.1002/chem.201603478
日期:2016.11.7
A systematic study on the effects of Lewis or Brønsted acid co‐catalysts in gold‐catalyzed reactions was undertaken using representative reactions (O‐, N‐, and C‐nucleophilic additions to alkynes). Through these reactions, it was demonstrated that an acidic co‐catalyst can increase the catalyst turnover significantly, enabling practical reaction rates at competitive catalyst loadings (<1 mol %). Further
Boronic acid catalyzed ene carbocyclization of acetylenic dicarbonyl compounds
作者:Meiling Li、Ting Yang、Darren J. Dixon
DOI:10.1039/b924899d
日期:——
The discovery and development of an efficient ene carbocyclization of 1,3-dicarbonyl compounds bearing pendent terminal alkyne substituents under 3-nitrobenzeneboronic acid catalysis is described. The reaction is efficient, easy to perform and general to a wide range of ketoester substrates.
A Highly Efficient and Broadly Applicable Cationic Gold Catalyst
作者:Deepika Malhotra、Mark S. Mashuta、Gerald B. Hammond、Bo Xu
DOI:10.1002/anie.201310239
日期:2014.4.22
Goldcatalysts capable of promoting reactions at low‐level loadings under mild conditions are the exception rather than the norm. We examined reactions where the regeneration of cationicgoldcatalyst (e.g., protodeauration) was the turnover limiting stage. By manipulating electron density on the substituents around phosphorus and introducing steric handles we designed a phosphine ligand that contains
The development of a novel cooperative catalytic system for an amine–silver co-catalyzed Conia-ene reaction of alkyne-tethered C–H-acidic compounds is reported.