Ruthenium-Catalyzed Oxidative C–H Alkenylations of Anilides and Benzamides in Water
摘要:
A cationic ruthenium(II) complex enabled efficient oxidative alkenylations of anilides in water as a green solvent and proved applicable to double C-H bond functionalizations of (hetero)aromatic amides with ample scope. Detailed studies provided strong support for a change of ruthenation mechanism in the two transformations, with an irreversible metalation as the key step in cross-dehydrogenative alkenylations of benzamides.
Microwave-Assisted Synthesis of Weinreb and MAP Aryl Amides via Pd-Catalyzed Heck Aminocarbonylation Using Mo(CO)<sub>6</sub> or W(CO)<sub>6</sub>
作者:Anna Wiȩckowska、Rebecca Fransson、Luke R. Odell、Mats Larhed
DOI:10.1021/jo102151u
日期:2011.2.4
A simple and expedient process for the Heck aminocarbonylative synthesis of Weinreb and MAP amide acylating agents, from aryl halides, is reported. This methodology utilizes solid sources of CO making it readily accessible to chemists working in small-scale laboratory applications.
A novel method was developed for the synthesis of tetrazoles from amides utilizing diphenyl phosphorazidate or bis(p-nitrophenyl) phosphorazidate as both the activator of amide–oxygen for elimination and azide source. Various amides were converted into the corresponding tetrazoles in good yields. This synthetic method allows to prepare 1,5-disubstituted and 5-substituted 1H-tetrazoles from various
A Convergent Synthesis of Functionalized Alkenyl Halides through Cobalt(III)‐Catalyzed Three‐Component C−H Bond Addition
作者:Jeffrey A. Boerth、Jonathan A. Ellman
DOI:10.1002/anie.201705817
日期:2017.8.7
A CoIII-catalyzed three-component coupling of C(sp2)−H bonds, alkynes, and halogenating agents to give alkenyl halides is reported. This transformation proceeds with high regio- and diastereoselectivity, and is effective for a broad range of aryl and alkyl terminal alkynes. Diverse C−H bond partners also exhibit good reactivity for a range of heteroaryl and aryl systems as well as synthetically useful
Cobalt(III)−Catalyzed C−H Activation: A Secondary Amide Directed Decarboxylative Functionalization of Alkynyl Carboxylic Acids Wherein Amide NH-group Remains Unreactive
作者:Nachimuthu Muniraj、Kandikere Ramaiah Prabhu
DOI:10.1002/adsc.201701406
日期:2018.4.3
A Co(III)‐catalyzedC−Hactivationreaction for ortho‐alkenylation of benzamides (aryl/heteroaryl) and C2‐alkenylation of indolederivatives have been developed using alkynyl carboxylic acid as an alkene source. A high regioselectivity has been achieved in the formation of disubstituted alkenes, and the possible cyclic products were not observed. This efficient alkenylation shows a broad range of substrate
Tetrazoles were effectively synthesized from amides using diphenyl phosphorazidate or bis(p-nitrophenyl) phosphorazidate in the presence of aromaticbases. Various amides underwent the proposed cycloaddition reaction to provide the corresponding tetrazoles. Studies on the racemization of chiral substrates were also performed. Overall, the proposed synthesis method enables the preparation of 1,5-disubstituted