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。
Continuous Flow Synthesis of Ketones from Carbon Dioxide and Organolithium or Grignard Reagents
作者:Jie Wu、Xiaoqing Yang、Zhi He、Xianwen Mao、T. Alan Hatton、Timothy F. Jamison
DOI:10.1002/anie.201405014
日期:2014.8.4
describe an efficient continuousflowsynthesis of ketones from CO2 and organolithium or Grignard reagents that exhibits significant advantages over conventional batch conditions in suppressing undesired symmetric ketone and tertiary alcohol byproducts. We observed an unprecedented solvent‐dependence of the organolithium reactivity, the key factor in governing selectivity during the flow process. A facile
We report that the nucleophilic acyl substitution reaction of aliphatic and (hetero)aromaticamides by organolithium reagents proceeds quickly (20 s reaction time), efficiently, and chemoselectively with a broad substrate scope in the environmentally responsible cyclopentyl methyl ether, at ambient temperature and under air, to provide ketones in up to 93 % yield with an effective suppression of the