Aldehyde-enamines from α-oxocarboxylic acids. A facile and general route to aldehydes via decarboxylation of α-oxocarboxylic acids carrying β-hydrogens
Trisubstituted pyridines are regioselectively synthesized through multicomponent and one-pot processes promoted by a bifunctional Pd-catalyst. The process involves formation of an enamine by Pd-catalyzed amination of an alkenyl bromide, formation of a 2-aza-1,3-butadiene by Pd-catalyzedcross-coupling of a trimethylsilylimine with an alkenyl bromide, and Lewis acid catalyzed cycloaddition between the
Divergent pathways to isophthalates and naphthalate esters from methyl coumalate
作者:Huangchao Yu、George A. Kraus
DOI:10.1016/j.tetlet.2018.09.058
日期:2018.11
Methyl coumalate readily reacts with enamines at ambient temperature to give lactones, which can be further transformed into isophthalates and tetrahydronaphthoates. Both cyclic and acyclic enamines show good reactivity. Dehydrogenation of tetrahydronaphthoate 4a was achieved on a hundred-gram scale. (C) 2018 Elsevier Ltd. All rights reserved.