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。
Directed lithiations: the effect of varying directing group orientation on competitive efficiencies for a series of tertiary amide, secondary amide, and alkoxide directed ortho lithiations
作者:Peter Beak、Shawn T. Kerrick、Donald J. Gallagher
DOI:10.1021/ja00076a022
日期:1993.11.1
Significant differences for competitive efficiencies in directed ortho lithiations for single functional groups in three series, the secondary benzamides 1-4, the tertiary benzamides 5-11, and the benzylic alcohols 12-17, are reported. For both amide series the efficiencies increase as the oxygen and ortho hydrogen in the substrate are more coplanar with the aromatic ring; however, for the alcohol
Direct <i>ortho</i> Cupration: A New Route to Regioselectively Functionalized Aromatics
作者:Shinya Usui、Yuichi Hashimoto、James V. Morey、Andrew E. H. Wheatley、Masanobu Uchiyama
DOI:10.1021/ja074669i
日期:2007.12.1
electrophilic functional groups, such as cyano, amide, and halogens. Direct cupration, followed by electrophilic trapping, provided a convenient preparative method for 1,2- or 1,2,3-multisubstituted aromatic compounds. The functionalized aromatic cuprate intermediates were also found to undergo oxidation reactions very efficiently and with high regio- and chemoselectivity to afford functionalized phenol,
Complex induced proximity effect enhancement in α-silyl carbanion generation. A general conversion of 2-silyl benzamides into 2-fluorosilylacetophenones
作者:Paul A. Brough、Stephen Fisher、Baoping Zhao、Ryan C. Thomas、Victor Snieckus
DOI:10.1016/0040-4039(96)00446-7
日期:1996.4
LDA treatment of 2-silylated benzamides 1 affords 2-fluorosilylated acetophenones 3 in a general process likely driven by CIPE-facilitated α-silylcarbanion formation and rearrangement (Scheme 3); oxidation (H2O2) of the products gives 2-hydroxyacetophenones and catechols (Scheme 4).
LDA处理2-甲硅烷基化的苯甲酰胺1在一般过程中可能由CIPE促进的α-甲硅烷基碳负离子的形成和重排驱动生成2-氟甲硅烷基化的苯乙酮3 (方案3);产物的氧化(H 2 O 2)得到2-羟基苯乙酮和儿茶酚(方案4)。