Increased Yields and Simplified Purification with a Second-Generation Cobalt Catalyst for the Oxidative Formation of <i>trans</i>-THF Rings
作者:Cory Palmer、Nicholas A. Morra、Andrew C. Stevens、Barbora Bajtos、Ben P. Machin、Brian L. Pagenkopf
DOI:10.1021/ol9023375
日期:2009.12.17
The synthesis of a second-generation cobalt catalyst for the formation of trans-THF products via the Mukaiyama aerobic oxidative cyclization is reported. Two procedures have been developed with the new water-soluble catalyst that give superior yields and greatly simplify purification compared to the previous catalysts.
Pd/C-Catalyzed Synthesis of Oxamates by Oxidative Cross Double Carbonylation of Amines and Alcohols under Co-catalyst, Base, Dehydrating Agent, and Ligand-Free Conditions
作者:Sandip T. Gadge、Bhalchandra M. Bhanage
DOI:10.1021/jo401038e
日期:2013.7.5
This work reports a mild, efficient, and ligand-free Pd/C-catalyzed protocol for the oxidative crossdoublecarbonylation of amines and alcohols. Notably, the reaction does not requires any base, co-catalyst, dehydrating agent, or ligand. Pd/C solves the problem of catalyst recovery, and the catalyst was recycled up to six times.