Catalytic Arylation of a CH Bond in Pyridine and Related Six-Membered N-Heteroarenes Using Organozinc Reagents
作者:Isao Hyodo、Mamoru Tobisu、Naoto Chatani
DOI:10.1002/asia.201100971
日期:2012.6
Despite significant advances in the catalytic direct arylation of heteroarenes, the application of this reaction to pyridines has been met with limited success. An oxidative nucleophilic arylation strategy has been developed to overcome this problem. Pyridine, pyrazine, quinolone, and related electron‐deficient N‐heteroarenes can be arylated at the most electrophilic site using the developed nickel‐catalyzed
A highly effective one-pot synthesis of quinolines from o-nitroarylcarbaldehydes
作者:An-Hu Li、Eilaf Ahmed、Xin Chen、Matthew Cox、Andrew P. Crew、Han-Qing Dong、Meizhong Jin、Lifu Ma、Bijoy Panicker、Kam W. Siu、Arno G. Steinig、Kathryn M. Stolz、Paula A. R. Tavares、Brian Volk、Qinghua Weng、Doug Werner、Mark J. Mulvihill
DOI:10.1039/b613775j
日期:——
A highly effective one-pot Friedländer quinoline synthesis using inexpensive reagents has been developed. o-Nitroarylcarbaldehydes were reduced to o-aminoarylcarbaldehydes with iron in the presence of catalytic HCl (aq.) and subsequently condensed in situ with aldehydes or ketones to form mono- or di-substituted quinolines in high yields (66–100%).
effective one-pot Friedländer quinolinesynthesisfrom o-nitroarylcarbaldehydes and ketones or aldehydes was developed and the scope and limitations of the method were examined. The o-nitroarylcarbaldehydes were reduced to o-aminoarylcarbaldehydes with iron in the presence of a catalytic amount of aqueous hydrochloric acid; the amino compounds were then condensed in situ with ketones or aldehydes to form