Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 72, Issue 1, Pages 144-149Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo061781a
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[GRAPHICS] (NHC) -Cu (NHC= N-heterocyclic carbene) complexes efficiently catalyzed the methylenation of a variety of aliphatic and aromatic aldehydes and ketones in the presence of trimethylsilyldiazomethane, triphenylphosphine, and 2-propanol. The copper catalysts are not only inexpensive compared to rhodium complexes, but they also exhibit better functional group compatibility with aromatic aldehydes and ketones. Indeed very high yields were obtained for the formation of styrenes containing nitro, trifluoromethyl, amino, and ester groups, as well as for pyridine-, pyrrole-, and indole-substituted alkenes.
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