Ir(<scp>iii</scp>)-Catalyzed direct C–H functionalization of <i>N</i>-phenylacetamide with α-diazo quinones: a novel strategy for producing 2-hydroxy-2′-amino-1,2′-biaryl scaffolds
作者:Xingjun Li、Jiang Wang、Xiong Xie、Wenhao Dai、Xu Han、Kaixian Chen、Hong Liu
DOI:10.1039/c9cc08297b
日期:——
α-Diazo quinones were applied in an Ir(iii)-catalyzed direct C-H functionalization assisted by N-phenylacetamide for the construction of highly functionalized 2-hydroxy-2'-amino-1,1'-biaryl scaffolds in good to excellent yields. This strategy features operational simplicity, atom- and step-economy and high efficiency.
Nucleophilic Aromatic Substitutions. Part XIV.. Investigation of the mechanism of hydroxy-denitration of 4,2-and 2,4-chloronitrobenzenediazonium ions as a function of pH
作者:Ivan I. Pikulik、Rudolf U. Weber、Heinrich Zollinger
DOI:10.1002/hlca.19810640607
日期:1981.9.23
4,2-Chloronitrobenzenediazonium ions in aqueous buffer solutions between pH 2.9 and 7.9 do not hydrolyze by dediazoniation as previous authors have assumed, but by denitration. The isomeric 2,4-compound reacts by denitration (ca. 70%) and dechlorination (ca. 30%). The reactions are general base catalyzed. The products and kinetics are consistent with an SNAr-mechanism in which the general base-catalyzed
pH值介于2.9和7.9之间的缓冲液中的4,2-氯硝基苯重氮离子不会像以前的作者所假设的那样通过脱重氮而水解,而是通过脱硝而水解。异构体2,4-化合物通过脱硝(约70%)和脱氯(约30%)反应。该反应是一般的碱催化的。产物和动力学与S N Ar机理一致,在该机理中,在反应的C原子上一般碱催化的羟基加成是限速的。在重氮nium cis的(p K 1 + p K 2)/ 2对应的pH值处或附近的最大速率重氮盐的平衡可以假设重氮离子是重氮化合物进入取代基的唯一平衡形式,并且涉及的所有亲核试剂的速率项k B [B]的叠加(H 2 O,OH -和缓冲碱基)。
Huisgen; Fleischmann, Justus Liebigs Annalen der Chemie, 1959, vol. 623, p. 47,55
作者:Huisgen、Fleischmann
DOI:——
日期:——
Kraaijeveld; Havinga, Recueil des Travaux Chimiques des Pays-Bas, 1954, vol. 73, p. 537,546
作者:Kraaijeveld、Havinga
DOI:——
日期:——
Ried,W.; Wagner,K., Justus Liebigs Annalen der Chemie, 1965, vol. 681, p. 45 - 51