Synthesis of (E)-3-Styrylquinolin-4(1H)-ones in Water by Ohmic Heating: a Comparison with Other Methodologies
作者:Joana Pinto、Vera L. M. Silva、Luis M. N. B. F. Santos、Artur M. S. Silva
DOI:10.1002/ejoc.201600150
日期:2016.6
Ohmicheating offers a very efficient way to perform organic reactions in aqueous media. Potentially bioactive (E)-3-styrylquinolin-4(1H)-ones were synthesized by the Heck reaction of 3-iodo-1-methylquinolin-4(1H)-one with styrenes in water and with ohmicheating. Pd(OAc)2 was used as catalyst, and tetrabutylammonium bromide was used as phase-transfer catalyst in the presence of an inorganic base.
Reactivity of 3-Iodo-4-quinolones in Heck Reactions: Synthesis of Novel (E)-3-Styryl-4-quinolones
作者:Artur Silva、Andreia Almeida、José Cavaleiro
DOI:10.1055/s-0029-1219175
日期:2010.2
A new and efficient route for the synthesis of (E)-N-methyl-3-styryl-4-quinolones is described. It involves the Heck reaction of N-methyl-3-iodo-4-quinolone, which is obtained by consecutive 3-iodination and NH-methylation of the unsubstituted 4-quinolone, with styrene derivatives. It is demonstrated that such a procedure is only efficient when the 3-iodo-4-quinolone has an N-protecting group. In some cases the branched regioisomers N-methyl-3-(1-phenylethenyl)-4-quinolones were also obtained as byproducts.