A Direct CH/ArH Coupling Approach to Oxindoles, Thio‐oxindoles, 3,4‐Dihydro‐1
<i>H</i>
‐quinolin‐2‐ones, and 1,2,3,4‐Tetrahydroquinolines
作者:Timothy E. Hurst、Ryan M. Gorman、Pauline Drouhin、Alexis Perry、Richard J. K. Taylor
DOI:10.1002/chem.201403917
日期:2014.10.20
A copper(II)‐catalysed approach to oxindoles, thio‐oxindoles, 3,4‐dihydro‐1H‐quinolin‐2‐ones, and 1,2,3,4‐tetrahydroquinolines via formal CH, ArHcoupling is described. In a new variant, copper(II) 2‐ethylhexanoate has been identified as an inexpensive and efficient catalyst for this transformation, which utilises atmospheric oxygen as the re‐oxidant.
Electrochemical dehydrogenative cyclization of 1,3-dicarbonyl compounds
作者:Zheng-Jian Wu、Shi-Rui Li、Hao Long、Hai-Chao Xu
DOI:10.1039/c8cc02472c
日期:——
The intramolecular C(sp3)–H/C(sp2)–H cross-coupling of 1,3-dicarbonyl compounds has been achieved through Cp2Fe-catalyzed electrochemical oxidation. The key to the success of these dehydrogenative cyclization reactions is the selective activation of the acidic α-C–H bond of the 1,3-dicarbonyl moiety to generate a carbon-centered radical.
Preparation of 3-Alkyl-Oxindoles by Copper(II)-Mediated C-H, Ar-H Coupling Followed by Decarboxyalkylation
作者:Richard Taylor、David. Pugh、Johannes Klein、Alexis Perry
DOI:10.1055/s-0029-1219392
日期:2010.4
A novel route for the conversion of anilides into 3-alkyl-oxindoles is described in which a copper(II)-mediated cyclization process is followed by an acid-mediated decarboxyalkylation. Scope and limitation studies are reported together with a telescoped variant which incorporates in situ N-deprotection.
Intramolecular Dehydrogenative Coupling of sp<sup>2</sup> C–H and sp<sup>3</sup> C–H Bonds: An Expeditious Route to 2-Oxindoles
作者:Santanu Ghosh、Subhadip De、Badrinath N. Kakde、Subhajit Bhunia、Amit Adhikary、Alakesh Bisai
DOI:10.1021/ol302767w
日期:2012.12.7
An intramolecular-dehydrogenative-coupling (IDC) using "transition-metal-free" oxidation conditions has been achieved to synthesize a variety of 2-oxindoles bearing an all-carbon quaternary stereogenic center at the benzylic position. The methodology involves a one-pot C-alkylation of beta-N-arylamido esters (3, 6) with alkyl halides using potassium tert-butoxide concomitant with a dehydrogenative coupling. A radical-mediated pathway has been tentatively proposed for the oxidative process.
Preparation of 3-Alkylated Oxindoles from N-Benzyl Aniline via a Cu(II)-Mediated Anilide Cyclization Process