AbstractA novel palladium‐catalyzed direct alkoxycarbonylation of 2‐arylpyridines, 2‐arylquinolines, benzo[h]quinolines, 2‐phenylpyrimidines, N‐pyrimidine pyrroles and N‐pyrimidine indoles via aromatic CH bond activation and selective CC cleavage of α‐keto esters has been developed. The method has the advantages of wide functional group tolerance, high selectivity, broad range of substrates and good yields.magnified image
regiospecifically, as demonstrated by subsequent quenching with electrophiles. The lithio derivative at C3′ is only evidenced from the benzamide at higher temperature (−50 °C), when treated with LTMP in THF; it instantly cyclizes to 1-chloro-4-azafluorenone. The latter is converted to onychine, an alkaloid endowed with anticandidal activity.
Palladium-Catalyzed Direct Alkoxycarbonylation of Aromatic CH Bonds<i>via</i>Selective CC Cleavage of α-Keto Esters
作者:Wei Zhou、Pinhua Li、Yicheng Zhang、Lei Wang
DOI:10.1002/adsc.201300436
日期:2013.8.12
AbstractA novel palladium‐catalyzed direct alkoxycarbonylation of 2‐arylpyridines, 2‐arylquinolines, benzo[h]quinolines, 2‐phenylpyrimidines, N‐pyrimidine pyrroles and N‐pyrimidine indoles via aromatic CH bond activation and selective CC cleavage of α‐keto esters has been developed. The method has the advantages of wide functional group tolerance, high selectivity, broad range of substrates and good yields.magnified image