Preparation of Methyl <i>N</i>‐Substituted Carbamates from Amides through <i>N</i>‐Chloroamides
作者:Gene A. Hiegel、Tyrone J. Hogenauer
DOI:10.1081/scc-200066695
日期:2005.8.1
Abstract Amides are chlorinated on the nitrogen using trichloroisocyanuric acid, and the N‐chloroamides are then rearranged to the corresponding methyl N‐substituted carbamates by sodium methoxide in methanol.
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
The synthesis of a set of cobalt(III)-complexes equipped with trisubstituted chiral cyclopentadienyl ligands is reported, and their steric and electronic parameters are mapped. The application potential of these complexes for asymmetric C-H functionalizations with 3d-metals is shown by the synthesis of dihydroisoquinolones from N-chlorobenzamides with a broad range of alkenes. The transformation proceeds
报道了一组配备三取代手性环戊二烯基配体的钴 (III) 配合物的合成,并绘制了它们的空间和电子参数。这些配合物在具有 3d 金属的不对称 CH 官能化方面的应用潜力通过从具有广泛烯烃的 N-氯苯甲酰胺合成二氢异喹诺酮类药物来展示。转化过程具有高达 99.5:0.5 er 的出色对映选择性和高区域选择性。对于这种反应类型,观察到的值优于基于铑 (III) 的最佳方法。此外,具有挑战性的底物(如烷基烯烃)也会与高区域选择性和对映选择性反应。