C−H activations with challenging arylacetamides were accomplished by versatile ruthenium(II) biscarboxylate catalysis. The distal C−H functionalization offers ample scope—including twofold oxidative C−H functionalizations and alkyne hydroarylations—through facile base‐assisted internal electrophilic‐type substitution (BIES) C−H ruthenation by weakO‐coordination.
具有挑战性的芳基乙酰胺的CH活化是通过通用的双羧酸钌(II)催化完成的。远端C H功能化提供了广泛的范围-包括双重的氧化C H H功能化和炔烃加氢芳基化-通过弱O配位通过碱辅助的内部亲电子型取代(BIES)CH H钌化。
Palladium-Catalyzed Amidation of N-Tosylhydrazones with Isocyanides
作者:Fengtao Zhou、Ke Ding、Qian Cai
DOI:10.1002/chem.201102459
日期:2011.10.24
N‐tosylhydrazones: The direct formation of keteniminesfromcarbenes and isocyanides is limited to the reaction of Fischer carbene complexes or some specially stabilized carbenes with isocyanides. A Pd‐catalyzed amidation of N‐tosylhydrazones with isocyanides via a ketenimine intermediate in the presence of water is described. The method offers a general way to synthesize amides from carbonyl compounds through one‐carbon
C−H hydroxylation of aryl acetamides and alkyl phenylacetyl esters was accomplished via challenging distal weak O‐coordination by versatile ruthenium(II/IV) catalysis. The ruthenium(II)‐catalyzedC−H oxygenation of aryl acetamides proceeded throughC−Hactivation, ruthenium(II/IV) oxidation and reductive elimination, thus providing step‐economical access to valuable phenols. The p‐cymene‐ruthenium(II/IV)