Palladium N-heterocyclic carbene catalyzed expected and unexpected C–C and C–N functionalization reactions of 1-aryl-3-methyl-1H-pyrazol-5(4H)-ones
作者:Vishal B. Purohit、Sharad C. Karad、Kirit H. Patel、Dipak K. Raval
DOI:10.1039/c6ra22779a
日期:——
A palladium N-heterocyclic carbene [Pd(NHC)Cl2] complex of vitamin B1 developed earlier in our laboratory was successfully employed as an efficientcatalyst for the regioselective C–C and C–N functionalization reactions of 1-aryl-3-methyl-1H-pyrazol-5(4H)-ones 1a–b. The catalyst was attempted for the C–H arylation, acylation and alkoxylation of 1a–b using the respective coupling substrates such as
A new class of pyrazolonederivatives has been isolated in good to excellent yields from the 2:1 condensation reaction between 3‐methyl‐1‐phenyl‐5‐pyrazolone and arylaldehydes in the presence of ionicliquid [HMIM]HSO4. The compounds were characterised by their IR, NMR spectra, MS and elemental analyses. The important features of the methodology are a wide application range of substrates, higher yields