共查询到20条相似文献,搜索用时 15 毫秒
1.
An efficient method for the copper-catalyzed N-arylation of hydroxylamines with aryl iodides is described. A variety of N- and O-functionalized hydroxylamines were transformed in good to excellent yield with a broad range of aryl coupling partners. Methods for the selective deprotection of either the N- or O-substituents for further functionalization are also described. 相似文献
2.
Ajay B. Naidu 《Tetrahedron letters》2008,49(19):3147-3151
A wide range of alkyl aryl ethers are synthesized from the corresponding aryl iodides and aliphatic alcohols through Ullmann-type intermolecular coupling reactions in the presence of a catalytic amount of easily available BINAM-CuI complex. Less reactive aryl bromides have also been shown to react with aliphatic alcohols under identical reaction conditions to give good yields of the alkyl aryl ethers without increasing the reaction temperature and time. 相似文献
3.
3,3-Disubstituted allyl alcohols from palladium-catalyzed coupling of hydroaluminated propargyl alcohols with aryl iodides 总被引:1,自引:0,他引:1
3,3-Disubstituted prop-2-en-1-ols 4 were synthesized with a high degree of stereoselectivity from 3-substituted prop-2-yn-1-ols 1 via hydroalumination and subsequent Pd-catalyzed coupling with aryl iodides 3. 相似文献
4.
Cross-coupling of diethyl phosphonate with aryl iodides was performed using copper(I) iodide complexes with various bidentate ligands as catalysts. 相似文献
5.
An efficient copper-catalyzed cross-coupling of aryl iodides with aryl acetylenes under microwave irradiation is described. The reaction proceeds under microwave heating with 10 mol % CuI and 2 equiv Cs2CO3 in 43-87% yields. 相似文献
6.
Knauber T Arikan F Röschenthaler GV Goossen LJ 《Chemistry (Weinheim an der Bergstrasse, Germany)》2011,17(9):2689-2697
Potassium (trifluoromethyl)trimethoxyborate is introduced as a new source of CF(3) nucleophiles in copper-catalyzed trifluoromethylation reactions. The crystalline salt is stable on storage, easy to handle, and can be obtained in near-quantitative yields simply by mixing B(OMe)(3), CF(3)SiMe(3), and KF. The trifluoromethylation reagent allows the conversion of various aryl iodides into the corresponding benzotrifluorides in high yields under mild, base-free conditions in the presence of catalytic quantities of a Cu(I)/1,10-phenanthroline complex. 相似文献
7.
Copper-catalyzed Ullmann coupling under ligand- and additive-free conditions. Part 2: S-Arylation of thiols with aryl iodides 总被引:1,自引:0,他引:1
Pongchart Buranaprasertsuk Joyce Wei Wei Chang Philip Wai Hong Chan 《Tetrahedron letters》2008,49(12):2023-2025
S-Arylation of a wide variety of substituted aryl and aliphatic thiols with aryl halides catalyzed by copper iodide under mild ligand- and additive-free conditions (nBu4NBr, PhMe, NaOH, reflux, 22 h) is accomplished in good to excellent product yields (up to 96%). 相似文献
8.
[reaction: see text] A mild method for the copper-catalyzed amination of aryl iodides is reported. This operationally simple C-N bond-forming protocol uses CuI as the catalyst and ethylene glycol as ligand in 2-propanol. A variety of functionalized aryl iodides as well as several amines were efficiently coupled using this method. This catalytic amination procedure is relatively insensitive to moisture and can be performed under an air atmosphere with comparable yield. Preliminary results on the amination of aryl bromides are also described. 相似文献
9.
Huan HeYong-Jin Wu 《Tetrahedron letters》2003,44(16):3385-3386
The copper-catalyzed N-arylation of sulfonamides with a variety of aryl bromides and iodides using microwave heating is described. 相似文献
10.
11.
A highly general, convenient, and inexpensive catalyst system was developed for the N-arylation of sulfonamides with aryl iodides or bromides by using 5-20 mol % of CuI as catalyst, 20 mol % of N-methylglycine (for aryl iodides) or N,N-dimethylglycine (for aryl bromides) as ligand, and K3PO4 as base. 相似文献
12.
A new, simple method for selectively synthesizing alkyl aryl ketones has been developed by palladium-catalyzed oxidative coupling of trialkylamines with aryl iodides. In the presence of PdCl(2)(MeCN)(2), TBAB, and ZnO, a variety of aryl iodides underwent an oxidative coupling reaction with tertiary amines and water to afford the corresponding alkyl aryl ketones in moderate to excellent yields. It is noteworthy that this method is the first example of using trialkylamines as the carbonyl sources for constructing alkyl aryl ketone skeletons. 相似文献
13.
A novel and efficient method for synthesis of 2-sulfenylindole via copper-catalyzed coupling reaction of indoline-2-thiones with aryl iodides has been developed. A series of N-substituted and N-free 2-sulfenylindole were obtained in high yields. Furthermore, the method was employed to synthesis of benzothieno[2,3-b]indoles from indoline-2-thiones with 1,2-diiodobenzene in the presence of CuI and Pd(OAc)2 as catalysts. 相似文献
14.
Sudhir Hande Adelphe Mfuh Scott Throner Ye Wu Qing Ye XiaoLan Zheng 《Tetrahedron letters》2019,60(41):151100
A new photoredox-catalyzed CN coupling reaction of sulfoximines with aryl halides has been developed for a general N-arylation of sulfoximines. The reactions proceed in the presence of visible light with high levels of chemoselectivity and a wide range of functionality is tolerated. There is a rapidly increasing interest in sulfoximines as pharmacophores in drug discovery and this new method offers potential in terms of high functional group tolerance and late-stage functionalization of compounds. 相似文献
15.
Yujeong Son Han-Sung Kim Ju-Hyeon Lee Jisun Jang Chin-Fa Lee Sunwoo Lee 《Tetrahedron letters》2017,58(14):1413-1416
A decarboxylative coupling reaction with an alkynyl carboxylic acid and aryl iodides in the presence of a nickel catalyst was developed. When the reaction was conducted with NiCl2 (10 mol%), Xantphos (15 mol%), Mn (1.0 equiv), and Cs2CO3 (1.5 equiv), the desired diaryl alkynes were formed in moderated to good yields. Furthermore, this method does not produce the diyne, which is formed in the homocoupling of alkynyl carboxylic acids. 相似文献
16.
Palladium-catalyzed deacetonative coupling of aryl propargylic alcohols with aryl chlorides in water
A highly efficient and green process for palladium-catalyzed deacetonative coupling of aryl propargylic alcohols with aryl chlorides has been developed. The reaction occurs smoothly in neat water with 2?mol% PdCl2 as catalyst, and various synthetically useful functional groups, including ether, aldehyde, ketone, and heterocyclics, are well tolerated. Moreover, the reaction could proceed through a consecutive Sonogashira/deacetonative process using 2-methyl-3-butyn-2-ol and aryl chlorides as coupling partners, affording the symmetric alkynes in good yields. 相似文献
17.
18.
A highly efficient copper-catalyzed coupling reaction of aryl iodides and thiobenzoic acid, using 10 mol % of copper iodide, 20 mol % of 1,10-phenanthroline, and iPr2NEt in toluene, was developed. This methodology is applicable to a variety of aryl iodides. 相似文献
19.
[reaction: see text] A palladium-catalyzed arylation of allylic acetates followed by beta-acetoxy elimination was shown to produce Heck-type coupling products. Optimal reaction conditions employed ligand-free palladium on carbon in the presence of tetrabutylammonium chloride, a trialkylamine base, and water. 相似文献
20.
Sperotto E van Klink GP de Vries JG van Koten G 《The Journal of organic chemistry》2008,73(14):5625-5628
A protocol for the copper-catalyzed aryl-sulfur bond formation between aryl iodides and thiophenols is reported. The reaction is catalyzed by a low amount (1-2.5 mol %) of readily available and ligand-free copper iodide salt. A variety of diaryl thioethers are synthesized under relatively mild reaction conditions with good chemoselectivity and functional group tolerance. 相似文献