Copper-Mediated<i>ortho</i>-Nitration of (Hetero)Arenecarboxylates
作者:Dmitry Katayev、Kai F. Pfister、Timo Wendling、Lukas J. Gooßen
DOI:10.1002/chem.201403363
日期:2014.8.4
Various (hetero)arenecarboxylic acids were converted to the corresponding Daugulis amides and nitrated selectively in the ortho‐position in the presence of [CuNO3(PPh3)2] and AgNO2 at 50 °C. A microwave‐assisted saponification allows regenerating the carboxylate group within minutes, which may then be removed tracelessly by protodecarboxylation, or substituted by aryl‐ or alkoxy‐groups via decarboxylative
diverse five‐membered lactams from aliphaticamides and terminal acetylenes with the assistance of an 8‐aminoquinolyl auxiliary has been achieved. A broad range of terminal acetylenes and aliphaticamides proved to be the efficient coupling partners, furnishing the corresponding lactams in moderate to good yields. The transformation is proven to undergo an oxidative alkynylation followed by the intramolecular
Cobalt-catalyzed cyclization of benzamides with alkynes: a facile route to isoquinolones with hydrogen evolution
作者:Ramasamy Manoharan、Masilamani Jeganmohan
DOI:10.1039/c8ob01924j
日期:——
benzamides with alkynes assisted by an 8-aminoquinoline ligand in the presence of Co(OAc)2·4H2O and pivalicacid under an air atmosphere provided isoquinolone derivatives in good to excellent yields. In this reaction, the active Co(III) species is regenerated by the reaction of Co(I) species with pivalicacid under an air atmosphere with hydrogen evolution. The proposed mechanism was supported by competition
A First Example of Cobalt-Catalyzed Remote CH Functionalization of 8-Aminoquinolines Operating through a Single Electron Transfer Mechanism
作者:Christopher J. Whiteoak、Oriol Planas、Anna Company、Xavi Ribas
DOI:10.1002/adsc.201600161
日期:2016.5.19
through a single electron transfer (SET) mechanism, although requiring elevated reaction temperatures. Herein, we described the first example of a cobalt‐catalyzed remoteCH functionalization of 8‐aminoquinoline compounds operating through a SET mechanism, exemplified using a practical and mild nitration protocol. The reaction uses inexpensive cobalt nitrate hexahydrate [Co(NO3)2⋅6 H2O] as catalyst and
for copper-catalyzed bromination of quinoline at the C5 site of quinoline by anodic oxidation was developed, affording the desired remote C-H activation products with isolated yields of up to about 90%. The reaction proceeds with low-cost NH4Br and shows mild and green conditions (electricity as a green oxidant; NH3 and H2 as byproducts). At the same time, a gram-scale bromination reaction was also successfully