Observations on the copper(II) catalyzed reactions of enaminones and dimethyl diazomalonate

RhII -Catalyzed β-C(sp2 )-H Alkylation of Enol Ethers, Enamides and Enecarbamates with α-Diazo Dicarbonyl Compounds

A Rh^II -catalyzed method for intermolecular alkylation of the β-C(sp² )-H bond of enol ethers, enamides, and enecarbamates with α-diazo-1,3-dicarbonyl compounds is reported. The products are formed in up to 99 % yield and can be readily derivatized under a variety of conditions. By utilizing a combination of experimental and computational studies, the presumptive addition-elimination reaction mechanism was investigated and found to proceed under thermodynamic control at higher temperature. The acquired fundamental knowledge was translated into a strategic reaction design and yielded the first example of the β-C-H functionalizations of acyclic enol ethers using α-diazo-1,3-dicarbonyl compounds.

Gold-catalyzed chemo- and diastereoselective C(sp(2))-H functionalization of enaminones for the synthesis of pyrrolo[3,4-c]-quinolin-1-one derivatives

An efficient tandem Au(i)/TsOH-catalyzed reaction of enaminones with diazo compounds for the synthesis of pyrroloquinolinone derivatives under mild reaction conditions has been developed. This methodology was realized by relay actions of Au and TsOH in a one-pot multistep manner. Initially, the Au-catalyzed reaction of enaminones with diazo compounds affords chemo- and diastereoselective C(sp(2))-H functionalized products, which then undergo subsequent intramolecular cyclization/rearrangement to give pyrroloquinolinone derivatives under the catalysis of TsOH.