Photochemical transformations. Part XXXII. Photolysis of thiobenzoic acid O-esters. Part III. Photolysis of O-phenethyl thiobenzoates and other thiobenzoates
作者:Derek H. R. Barton、Michael Bolton、Philip D. Magnus、Keshav G. Marathe、Gerald A. Poulton、Peter J. West
DOI:10.1039/p19730001574
日期:——
Homoallylic alcohols can be dehydrated under exceptionally mild conditions by conversion into their thiobenzoate O-esters and irradiation between –70° and room temperature. A variety of substrates have been dehydrated by this method.
Cobalt(III)-Catalyzed [4 + 2] Annulation of <i>N</i>-Chlorobenzamides with Maleimides
作者:Nachimuthu Muniraj、Kandikere Ramaiah Prabhu
DOI:10.1021/acs.orglett.8b04117
日期:2019.2.15
A Co(III)-catalyzed novel [4 + 2] annulation of N-chlorobenzamides with maleimides has been reported. Mostly, maleimides are known to furnish the Michael-type or 1,1-type cyclized products while treating with amides. In this reaction, maleimides furnished [4 + 2] annulated products in good yields at room temperature while being treated with the internal oxidizing N-chlorobenzamide as a directing group
Cobaltacycle synthesis via C–H activation has been achieved for the first time, providing key mechanisticinsight into cobalt catalytic chemistry. N-Chloroamides are used as a directing synthon for cobalt-catalyzed room-temperature C–H activation and construction of heterocycles. Alkynes as coupling partners allow convenient access to isoquinolones, a class of synthetically and pharmaceutically important
Cobalt(<scp>iii</scp>)-catalyzed redox-neutral [4+2]-annulation of <i>N</i>-chlorobenzamides/acrylamides with alkylidenecyclopropanes at room temperature
作者:Balu Ramesh、Masilamani Jeganmohan
DOI:10.1039/d1cc00654a
日期:——
An efficient synthesis of substituted 3,4-dihydroisoquinolinones through [4+2]-annulation of N-chlorobenzamides/acrylamides having a monodentate directing group with alkylidenecyclopropanes in the presence of a less expensive, highly abundant and air stable Co(III) catalyst via a C–H activation is demonstrated. In this reaction, the N–Cl bond of N-chlorobenzamide serves as an internal oxidant and thus