Chitosan-SO3H is found to catalyze the Friedländer condensation/annulation reaction of 2-aminoaryl ketones with α-methyleneketones to produce the corresponding quinolinederivatives in high yields in short reaction times. The use of recyclable and biodegradable chitosan-SO3H makes this method quite simple, more convenient, and economically viable compared to acid catalyzed methods reported in the literature
Copper triflate catalyzed annulation of 2-aminoaryl ketones with internal alkynes has been developed for the synthesis of polysubstituted quinolines in high yields under solvent-free conditions. Phenyl propiolic acid afforded the 3-unsubstituted quinolines via decarboxylation. The protocol is compatible with various internal alkynes and is expected to find wide applications due to its operational simplicity.
Synthesis of quinoline/oxindole appended phenylvinyl-2,5-dihydrofuran derivatives via ring-closing enyne metathesis
作者:Kevin George、Sathananthan Kannadasan
DOI:10.1016/j.tet.2023.133544
日期:2023.8
5-dihydrofuran derivatives. The synthesis involved multiple steps, starting with the base-promoted nucleophilic addition of terminal alkynes to specific carbonyl compounds (11H-indeno[1,2-b]quinolin-11-one and isatin derivatives). The resulting propargyl alcohol derivatives were then subjected to O-allylation. Subsequently, the 1,6-enyne compounds obtained underwent ring-closing enyne metathesis using Grubb's