Directed <i>ortho</i>-metalation–nucleophilic acyl substitution strategies in deep eutectic solvents: the organolithium base dictates the chemoselectivity
作者:Simone Ghinato、Giuseppe Dilauro、Filippo Maria Perna、Vito Capriati、Marco Blangetti、Cristina Prandi
DOI:10.1039/c9cc03927a
日期:——
Directed ortho metalation (DoM) or nucleophilic acylsubstitution (SNAc) can be efficiently programmed on the same aromatic carboxylic acid amide, in a choline chloride-based eutectic mixture, by simply switching the nature of the organolithium reagent. Telescoped, one-pot ortho-lithiation/Suzuki–Miyaura cross-couplings have also been demonstrated for the first time in Deep Eutectic Solvents.
定向邻位金属化(d Ò M)或亲核酰基取代(S Ñ AC)可以有效地设定为在同芳族羧酸酰胺,在基于氯化物胆碱共熔混合物,通过简单地切换有机锂试剂的性质。伸缩式单罐正锂化/铃木-宫浦交叉联结也已在深共晶溶剂中首次得到证明。
Nickel or Phenanthroline Mediated Intramolecular Arylation of sp<sup>3</sup> C–H Bonds Using Aryl Halides
作者:William C. Wertjes、Lydia C. Wolfe、Peter J. Waller、Dipannita Kalyani
DOI:10.1021/ol402869h
日期:2013.12.6
the intramolecular arylation of sp3 C–Hbonds adjacent to nitrogen using aryl halides is described. Arylation was accomplished using either Ni(COD)2 or 1,10-phenanthroline in substoichiometric amounts, and the reaction conditions were applied to a variety of electronically differentiated benzamide substrates. Preliminary studies suggest a mechanism involving aryl and alkyl radical intermediates.
We report a uniquely high-yielding, general, and practical ortho bromination and iodination reaction of different classes of aromatic compounds. This reaction occurs by Rh(III)-catalyzed C-H bond activation methodology and is therefore the first example of the application of this cationic catalyst for C-Br and C-I bond formation.
Nickel-Mediated Synthesis of Isoindolinones at Room Temperature
This communication describes a method for the Ni(cod)(2)-mediated intramolecular arylation of alkyl C-H bonds adjacent to the nitrogen atom in benzamide substrates. The transformation proceeds at room temperature and exhibits selectivity for functionalization of more substituted C-H bonds. The yields of the desired isoindolinone products are higher with benzamide substrates containing tertiary alkyl groups on the nitrogen atom than with those bearing primary or secondary alkyls. The results described herein suggest a mechanism involving radical intermediates for these reactions.