Combining C-H functionalisation and flow photochemical heterocyclic metamorphosis (FP-HM) for the synthesis of benzo[1,3]oxazepines
摘要:
C-H Activation/functionalisation and Flow Photochemical Heterocyclic Metamorphosis (FP-HM) have been combined to synthesize a library of benzo [1,3]oxazepines, a rarely described heterocyclic family. This combined protocol allows a range of arylated products to be made from simple starting materials, and the cheap flow photochemical system has proven effective for rapid synthesis of gram-quantities of benzo [1,3]oxazepines. (C) 2018 Elsevier Ltd. All rights reserved.
KMnO 4 -mediated direct selective radical cross-coupling: An effective strategy for C2 arylation of quinoline N -oxide with arylboronic acids
作者:Jin-Wei Yuan、Ling-Bo Qu
DOI:10.1016/j.cclet.2017.01.016
日期:2017.5
arylboronic acids is achieved using KMnO4 as the sole and efficient oxidative system. This method provides an efficient protocol to construct regioselectively 2-arylquinoline N-oxides via radical cross-coupling reaction in moderated to good yields under mild conditions.
Visible-Light-Promoted C2 Selective Arylation of Quinoline and Pyridine <i>N</i>-Oxides with Diaryliodonium Tetrafluoroborate
作者:Dazhi Li、Ce Liang、Zaixing Jiang、Junzheng Zhang、Wang-Tao Zhuo、Fan-Yue Zou、Wan-Peng Wang、Guo-Lin Gao、Jinzhu Song
DOI:10.1021/acs.joc.9b02933
日期:2020.2.21
visible-light-promoted C2 selective arylation of quinoline and pyridineN-oxides, with diaryliodonium tetrafluoroborate as an arylation reagent, using eosin Y as a photocatalyst for the construction of N-heterobiaryls was presented. This methodology provided an efficient way for the synthesis of 2-aryl-substituted quinoline and pyridineN-oxides. This strategy has the following advantages: specific regioselectivity
s with Zn/NH4Cl gave the corresponding quinoline N‐oxides in 80–90% yields. The reaction initiated the reduction of nitro group to afford the corresponding hydroxylamine, which intramolecularly condensed and followed by dehydration to give quinoline N‐oxide. Although treatment of 2‐nitrochalcone with Zn/NH4Cl in EtOH/H2O resulted in the formation of quinoline N‐oxide in low yield, the reaction of 2‐nitrochalcone
Decarboxylative cross‐coupling reactions of substituted 2‐carboxyazine N‐oxides, with a variety of (hetero)arylhalides, by bimetallic Pd0/CuI and Pd0/AgI catalysis are reported. Two possible pathways, a conventional bimetallic‐catalyzed decarboxylative arylation, as well as a protodecarboxylative/direct CH arylation sequence have been considered. These methods provide the first general decarboxylative
据报道,通过双金属Pd 0 / Cu I和Pd 0 / Ag I催化,取代的2-羧嗪N-氧化物与各种(杂)芳基卤化物发生脱羧交叉偶联反应。两种可能的途径,传统的双金属催化的芳基化脱羧,以及一个protodecarboxylative /直接ç ħ芳基化序列已被考虑。这些方法为2-羧嗪系列提供了第一个通用的脱羧芳基化方法。