Acylation of Alkenes with the Aid of AlCl3 and 2,6-Dibromopyridine
摘要:
Friedel-Crafts-type acylation of alkenes with acyl chlorides has been successfully conducted with a wide substrate scope by the combined use of AlCl3 and 2,6-dibromopyridine. Trisubstituted alkenes afford allylketones or vinylketones depending on the presence or absence of hydrogen atom(s) at the beta-position to the acylation site, while monosubstituted alkenes exclusively afford vinylketones.
Reactions of N-phenylamide and phenyl (thio)esters of 3-phenylpropiolic acid with benzene under superelectrophilic activation
作者:D. S. Ryabukhin、A. V. Vasilyev、S. Yu. Vyazmin
DOI:10.1007/s11172-012-0117-3
日期:2012.4
N-Phenylamide and phenyl (thio)esters of 3-phenylpropiolic acid add benzene in the presence of CF3SO3H or AlX3 (X = Cl, Br) to give 4,4-diphenyl-3,4-dihydroquinolin-2-one, 4,4-diphenyl-3,4-dihydrocoumarin, and 4,4-diphenyl-3,4-dihydrothiocoumarin, respectively.
We report a highly regioselective three-componentcouplingreaction of styrene, CO gas, and an amine compound to synthesize multisubstituted α,β-unsaturated amides, which involves a palladium-catalyzed sequential 1,4-palladium migration, C(sp2)–H activation, carbonylation, and amination. Salient features of this strategy include the use of 1 atm of CO, excellent stereochemistry, and good functional