Visible-Light-Promoted Oxidative Amidation of Bromoalkynes with Anilines: An Approach to α-Ketoamides
作者:Ke Ni、Ling-Guo Meng、Kuai Wang、Lei Wang
DOI:10.1021/acs.orglett.8b00586
日期:2018.4.20
A convenient and practical synthetic route to α-ketoamides from bromoalkynes and anilines through phototriggered organic transformations via a C–N cross-coupling and an oxidation of C≡C was developed. The reaction could be furnished without an external photocatalyst at ambient conditions, and a wide range of α-ketoamides were obtained in good yields.
Reductive cyclization of halo-ketones to form 3-hydroxy-2-oxindoles via palladium catalyzed hydrogenation: a hydrogen-mediated Grignard addition
作者:Inji Shin、Stephen D. Ramgren、Michael J. Krische
DOI:10.1016/j.tet.2015.05.085
日期:2015.9
The reductive cyclization of N-oxoacyl ortho-bromoanilides to form 3-hydroxy-2-oxindoles under the conditions of palladium catalyzed hydrogenation is described. This work may be viewed as a prelude to intermolecular hydrogen-mediated Grignard-type reductive couplings of organic halides with carbonyl compounds.
A nickel-catalyzed intramolecularaddition of vinyl or aryl bromides to ketoamides has been developed. The reactions proceeded efficiently with Ni(bpy)Br2 as a catalyst and zinc powder as reducing agent, affording 3-hydroxypyrrolidinones, 3-hydroxyoxindoles, and dihydroquinolinones as important heterocyclic compounds in good to excellent yields.
Synthesis of dihydroquinoxaline-2(1H)-ones via palladium-catalyzed intramolecular C–N bond formation
作者:Jetsuda Areephong、Bright Huo、Ifenna I. Mbaezue、Kai E.O. Ylijoki
DOI:10.1016/j.tetlet.2016.06.008
日期:2016.7
A new strategy for the preparation of highly-substituted dihydroquinoxaline-2(1H)-ones is reported. The strategy harnesses a divergent NaI-catalyzed amine substitution of mesylates to prepare a range of sterically hindered amidoamine substrates. These substrates are then subjected to Pd(dba)2/P(tBu)3 mediated cyclization. The preparation of amidoalcohol substrates occurs with reasonable yields (40–84%)