Cross-Coupling Reactions of Aryl Halides with Amines, Phenols, and Thiols Catalyzed by an N,N′-Dioxide-Copper(I) Catalytic System
作者:Haitao Yang、Chao Xi、Zhiwei Miao、Ruyu Chen
DOI:10.1002/ejoc.201100274
日期:2011.6
reactions of various N, O, and S nucleophilic reagents with aryl halides have been successfully carried out under mild conditions by using a novel chiral N,N′-dioxide–copper(I) catalytic system as the catalyst. This versatile and efficient catalyst system has been demonstrated to facilitate the cross-coupling reactions of aryl halides with amines,phenols, and thiols to afford the corresponding desired
通过使用新型手性 N,N'-二氧化物-铜 (I) 催化体系作为催化剂,各种 N、O 和 S 亲核试剂与芳基卤化物的偶联反应已在温和条件下成功进行。这种多功能且高效的催化剂体系已被证明可促进芳基卤化物与胺、酚和硫醇的交叉偶联反应,从而以良好至极好的收率提供相应的所需产物。
AgNO<sub>3</sub> as nitrogen source for rhodium(<scp>iii</scp>)-catalyzed synthesis of 2-aryl-2H-benzotriazoles from azobenzenes
A new approach has been established for Rh(iii)-catalyzed direct aza oxidative cyclization of non-prefunctionalized azobenzenes to provide 2-aryl-2H-benzotriazoles in good yields.
Reported is the condensation between o‐arylenediamines and nitroarenes enabled by a cooperative action of acid and base, providing a direct entry to 2‐aryl‐2H‐benzotriazoles. The potential practicability of this methodology was demonstrated by 100 mmol‐scale reactions and the synthesis of serotonin/dopamine receptor ligand and human growth hormone.
Deproto-metallation using a mixed lithium–zinc base and computed CH acidity of 1-aryl 1H-benzotriazoles and 1-aryl 1H-indazoles
作者:Elisabeth Nagaradja、Floris Chevallier、Thierry Roisnel、Vincent Dorcet、Yury S. Halauko、Oleg A. Ivashkevich、Vadim E. Matulis、Florence Mongin
DOI:10.1039/c3ob42380h
日期:——
1-Aryl-1H-benzotriazoles and -1H-indazoles were synthesized, and their deproto-metallation using the base prepared by mixing LiTMP with ZnCl2·TMEDA (1/3 equiv.) was studied. In the indazole series, reactions occurring at the 3 position were followed by ring opening, and functionalization of the substrate was only found possible (on the sulfur ring) using 2-thienyl as aryl group. In the benzotriazole series, either mono- or bis-deprotonation (depending on the amount of base employed) was achieved with phenyl, 4-methoxyphenyl and 2-thienyl as aryl group, and bis-deprotonation in the case of 4-chlorophenyl and 4-trifluoromethylphenyl. The experimental results were analyzed with the help of the CH acidities of the substrates, determined in THF solution using the DFT B3LYP method.
The reaction of ortho-substituted aromatic azides with boron trichloride or trifluoride
作者:Piero Spagnolo、Paolo Zanirato
DOI:10.1039/p19880002615
日期:——
The reaction of borontrichloride or trifuoride with ortho-aryl, -diazoaryl, and -arylazoaryl phenyl azides in benzene at room temperature generally gives fused azoles in high yields. Treatment of 2-nitrophenyl azide with borontrichloride mainly affords chlorinated nitroanilines, whereas with borontrifluoride it gives N-o-nitrophenylaniline. In aromatic solvents at 60 °C in the presence of boron trifluoride–diethyl