Fourteen N- and/or 2-substituted 4-fluoroanilines were prepared (the series includes N-C2-bridged compounds), Some of them were found to be thermally unstable when dissolved in chloroform. Both F-19 NMR spectra and comparison of GIAO-DFT calculated and experimental C-13 chemical shifts were used to suggest decomposition products of 4-fluoroanilines. (C) 2001 Elsevier Science B.V. All rights reserved.
A rhodium(III)-catalyzed C–H allylation of (hetero)arenes by using 2-methylidenetrimethylene carbonate as an efficient allylic source has been developed for the first time. Five different directing groups including oxime, N-nitroso, purine, pyridine, and pyrimidine were compatible, delivering various branched allylarenes bearing an allylic hydroxyl group in moderate to excellent yields.
Rhodium(III)-Catalyzed Directed C−H Amidation of <i>N</i>
-Nitrosoanilines and Subsequent Formation of 1,2-Disubstituted Benzimidazoles
作者:Yanyu Chen、Rong Zhang、Qiujun Peng、Lanting Xu、XianHua Pan
DOI:10.1002/asia.201701287
日期:2017.11.2
An efficient rhodium‐catalyzeddirectC−Hamidation of N‐nitrosoanilines with 1,4,2‐dioxazol‐5‐ones as amidating agents has been developed. This method featured mild reaction conditions, a wide substrate scope and satisfactory yields. Besides, the amidated products could be readily converted to pharmaceutically valuable 1,2‐disubstituted benzimidazoles via an HCl‐mediated deprotection/cyclization process
We report herein a Rh(III)-catalyzed cyclization of N-nitrosoanilines with alkynes for streamlined synthesis of indoles. The synthetic protocol features a distinct internal oxidant, N-N bond, as a reactive handle for catalyst turnover, as well as a hitherto tantalizingly elusive intermolecular redox-neutral manifold, predicated upon C-H activation, for the formation of a five-membered azaheterocycle
An efficient and mild protocol for regioselective synthesis of N-Nitroso aryl ketones by palladium-catalyzed directacylation of arenes using N-Nitroso as directing groups is described. This reaction proceeded smoothly and could tolerate a variety of functional groups. Moreover, this chemistry offers a convenient access to a range of indazoles.
Palladium-Catalyzed Decarboxylative Acylation of <i>N</i>-Nitrosoanilines with α-Oxocarboxylic Acids
作者:Yinuo Wu、Lei Sun、Yunyun Chen、Qian Zhou、Jia-Wu Huang、Hui Miao、Hai-Bin Luo
DOI:10.1021/acs.joc.5b02535
日期:2016.2.5
A palladium-catalyzed oxidative C–H bond decarboxylative acylation of N-nitrosoanilines using α-oxocarboxylic acid as the acyl source is described. The catalyst Pd(OAc)2 and oxidant (NH4)2S2O8 enabled ortho-acylation of N-nitrosoanilines at room temperature, affording an array of N-nitroso-2-aminobenzophenones in moderate to excellent yields.
描述了使用α-氧代羧酸作为酰基源的钯催化的N-亚硝基苯胺的氧化C–H键脱羧酰化反应。催化剂Pd(OAc)2和氧化剂(NH 4)2 S 2 O 8可以在室温下对N-亚硝基苯胺进行邻酰化,从而以中等至极好的收率提供了一系列N-亚硝基-2-氨基二苯甲酮。