The Rh(III)-catalyzed amidation of C(sp2)-H bonds has been reported by employing the N-methoxyamide as a novel amino source. An excellent level of functional group tolerance can be achieved when N-methoxyamide derivatives are used as the amidating reagents. Importantly, several known bioactive compounds such as Aminalon, Pregabalin, Gabapentin, and Probenecid can be transformed to effective amidating
Rh(III)-Catalyzed C–H Activation/Cyclization of Benzamides and Diazonaphthalen-2(1<i>H</i>)-ones for Synthesis of Lactones
作者:Renjie Chen、Sunliang Cui
DOI:10.1021/acs.orglett.7b01728
日期:2017.8.4
A Rh(III)-catalyzed C–Hactivation/cyclization of benzamides and diazonaphthalen-2(1H)-ones for synthesis of lactones has been developed. In the presence of Rh(III) catalysis, the benzamides would form rhodacycle species and could be trapped by diazonaphthalen-2(1H)-ones for arylation, and the following intramolecular lactonization would rapidly furnish the products. Thus, the diazonaphthalen-2(1H)-ones
Direct Access to Isoindolinone Derivatives by Palladium-Catalyzed C–H Activation and Isocyanide Insertion by Using Molecular Oxygen as the Sole Oxidant
aerobic, palladium-catalyzed C–H activation, followed by isocyanide insertion to synthesize isoindolinone derivatives. This transformation is an efficient and step-economic strategy usingoxygen as the soleoxidant. We anticipate that this work will inspire in-depth studies as well as versatile applications in various related fields. We report a straightforward, aerobic, palladium-catalyzed C–H activation
Microwave-Assisted Synthesis of Heterocycles by Rhodium(III)-Catalyzed Annulation of <i>N</i>
-Methoxyamides with α-Chloroaldehydes
作者:Ji-Rong Huang、Carsten Bolm
DOI:10.1002/anie.201710776
日期:2017.12.11
α‐Chloroaldehydes have been used as alkyne equivalents in rhodium‐catalyzed syntheses of isoquinolones and 3,4‐dihydroisoquinolins starting from N‐methoxyamides. Compared to the existing technology, a complementary regioselectivity is achieved. Mechanistic investigations have been performed, and it was found that steric effects of both substrate and additive determine the product selectivity. Various
Harnessing hypervalent iodonium ylides as carbene precursors: C–H activation of <i>N</i>-methoxybenzamides with a Rh(<scp>iii</scp>)-catalyst
作者:Sivakalai Mayakrishnan、Masilamani Tamizmani、Naryanan Uma Maheswari
DOI:10.1039/d0cc06038k
日期:——
Hypervalentiodoniumylides expeditiously generate carbenes which undergo domino intermolecular C–H activation followed by intramolecular condensation in the presence of N-methoxybenzamide as a starting material and a Rh(III)-catalyst to afford dihydrophenanthridines. KIE studies and DFT calculations were performed to substantiate the mechanistic pathway. To extend the synthetic utilisation, fluorescent