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.
A novel copper(II)-mediated route for the conversion of anilides into 3,3-disubstituted-oxindoles is described which proceeds via a formal CâH, ArâH coupling process.
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