Cobalt-Catalyzed, Aminoquinoline-Directed C(sp<sup>2</sup>)H Bond Alkenylation by Alkynes
作者:Liene Grigorjeva、Olafs Daugulis
DOI:10.1002/anie.201404579
日期:2014.9.15
A method for cobalt‐catalyzed, aminoquinoline‐ and picolinamide‐directed C(sp2)Hbondalkenylation by alkynes was developed. The method shows excellent functional‐group tolerance and both internal and terminal alkynes are competent substrates for the coupling. The reaction employs a Co(OAc)2⋅4 H2O catalyst, Mn(OAc)2 co‐catalyst, and oxygen (from air) as a terminal oxidant.
开发了一种钴催化、氨基喹啉和吡啶酰胺引导的炔烃 C(sp 2 ) H 键烯基化方法。该方法显示出优异的官能团耐受性,内部和末端炔烃都是偶联的有效底物。该反应采用Co(OAc) 2 ⋅4 H 2 O催化剂、Mn(OAc) 2助催化剂和氧气(来自空气)作为终端氧化剂。
Copper-Mediated Remote Highly Site-Selective C-H Bond Bromination and Chlorination of Quinolines at the C5 Position that is Geometrically Difficult to Access
Abstract: We report a concise and efficient method for the remoteC-Hbond halogenation (Br & Cl) of 8-aminoquinoline scaffolds on the C5position that is geometricallydifficult to access. The protocol makes use of inexpensive CuBr2 and CuCl2 as a mediator and shows good tolerance toward numerous N-(8-quinolinyl)-benzamides, giving the corresponding products in good to excellent yield.
C5-benzoxylation with benzoylperoxide produced a variety of potentially bioactive 8-arylcarboxamido-5-benzoyloxy quinoline derivatives. The efficiency of the reaction reflects from the wide substrate scope with electronic differentiation on carboxamide and acyl peroxide in addition to tolerance of halo substitutions on either of the aryls. The reaction is additive, silver free and proceeds without
The oxygenation of 8-aminoquinoline amides by benzoyl peroxide at the C5 position in water is developed in the absence of a transition metal catalyst, affording the desired products in moderate to good yields of up to 88%. Mechanism studies reveal that the reaction would involve a radical process.
An oxidant-free electrochemical regioselective chlorination of 8-aminoquinoline amides at ambient temperature in batch and continuous-flow was achieved. Inert DCM was used as the chlorinating reagent. Owing to the continuous-flow setup, the reaction scale up can be achieved conveniently with higher productivity. Moreover, this method has good position-control, and water and air tolerance. Costly quaternary