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.
Low-Temperature, Transition-Metal-Free Cross-Dehydrogenative Coupling Protocol for the Synthesis of 3,3-Disubstituted Oxindoles
作者:James R. Donald、Richard J. K. Taylor、Wade F. Petersen
DOI:10.1021/acs.joc.7b02085
日期:2017.10.20
strong, nonreversible base in these reactions has been found to effect a dramatic drop in reaction temperature (to room temperature) relative to the current state-of-the-art (>100 °C) procedure. When employing iodine as an “oxidant”, new evidence suggests that this transformation may occur via a transiently stable iodinated intermediate rather than by direct single-electron oxidation.
A novel method for the synthesis of 2‐oxindoles from 1,3‐dicarbonyl compounds based on ferrous salt and iodide catalyst was described. Through a new catalytic oxidation system, the intramolecular dehydrogenation coupling reaction was completed by using catalytic amount of iodine.
Atom economical synthesis of oxindoles by metal-catalyzed intramolecular C–C bond formation under solvent-free and aerobic conditions
作者:Se In Son、Won Koo Lee、Jieun Choi、Hyun-Joon Ha
DOI:10.1039/c5gc00703h
日期:——
Diversely substituted oxindoles were obtained from atom economical direct C-C bondformation reactions of various substituted anilides and pyridinylamides with metal salts as catalysts including Cu2O, FeCl3, Fe2O3, TiO2, ZnO,...
Di-tert-butyl peroxide (DTBP) promoted dehydrogenative coupling: an expedient and metal-free synthesis of oxindoles via intramolecular C(sp<sup>2</sup>)–H and C(sp<sup>3</sup>)–H bond activation
作者:Biplab Mondal、Brindaban Roy
DOI:10.1039/c5ra09055e
日期:——
An efficient di-tert-butyl peroxide (DTBP) promoted synthesis of oxindole has been developed. This methodology involves C(sp3)–H and C(sp2)–H bond activation under metal-free conditions. This synthetic approach towards oxindole synthesis avoids bases and hazardous iodine reagents unlike other methodologies developed so far. This metal- and base-free protocol is operationally simple and ecofriendly