highly chemo- and regioselective vicinal trifunctionalization of aryliodides by palladium/norbornene (Pd/NBE) catalysis. The key feature of this new method is the introduction of two distinct nitrogen and carbon electrophiles, with a large gap in reactivity, for ortho-unsubstituted aryliodides via an intermolecular and intramolecular C―H functionalization, respectively. Eight types of ipso terminations
N-benzoyloxyamines, and norbornadiene. The Catellani and retro-Diels-Alder strategy was used in this domino process. o-Iodoaniline, with electron-donating and sterically hindered protecting groups, made the reaction selective toward o-C-H amination. On the basis of density functional theory calculations, the intramolecular Buchwald coupling of this reaction underwent a dearomatization and a 1,3-palladium migration
Ligand-Promoted <i>meta</i>-C–H Amination and Alkynylation
作者:Peng Wang、Gen-Cheng Li、Pankaj Jain、Marcus E. Farmer、Jian He、Peng-Xiang Shen、Jin-Quan Yu
DOI:10.1021/jacs.6b08942
日期:2016.10.26
Using a modified norbornene (methyl bicyclo[2.2.1]hept-2-ene-2-carboxylate) as a transient mediator, meta-C-H amination and meta-C-H alkynylation of aniline and phenol substrates have been developed for the first time. Both the identification of a monoprotected 3-amino-2-hydroxypyridine/pyridone-type ligand and the use of a modified norbornene as a mediator are crucial for the realization of these
Double Heteroatom Functionalization of Arenes Using Benzyne Three-Component Coupling
作者:José-Antonio García-López、Meliha Çetin、Michael F. Greaney
DOI:10.1002/anie.201410751
日期:2015.2.9
Arynes participate in three‐component coupling reactions with N, S, P, and Se functionalities to yield 1,2‐heteroatom‐difunctionalized arenes. Using 2‐iodophenyl arylsulfonates as benzyne precursors, we could effectively add magnesiated S‐, Se‐, and N‐nucleophilic components to the strained triple bond. In the same pot, addition of electrophilic N, S, or P reagents and a copper(I) catalyst trapped