Phase-Vanishing Method with Acetylene Evolution and Its Utilization in Several Organic Syntheses
摘要:
A novel quadraphasic phase-vanishing system in which acetylene is evolved from calcium carbide and directly applied in situ to the Sonogashira coupling reaction was developed. This method, which provides a safe, convenient, and one-pot means to utilize gaseous reagents without special equipment, was also applied to a Cu-catalyzed azide-alkyne cycloaddition (CuAAC) reaction and a three-component aldehyde-alkyne-amine (A(3)) coupling reaction with excellent results.
Palladium-catalyzed oxidative CH/CH cross-coupling of pyridine <i>N</i>-oxides with five-membered heterocycles
作者:Wei Liu、Xin Yu、Yahui Li、Chunxiang Kuang
DOI:10.1039/c4cc04129a
日期:——
Using Ag2CO3 as an additive, we developed the Pd-catalyzed intermolecular C-H/C-H cross-coupling of pyridine N-oxides with five-membered heterocycles such as 1-benzyl-1,2,3-triazoles, thiophens and furans. This protocol provides an efficient and regioselective approach for the synthesis of unsymmetrical biheteroaryl molecules.
Self-Assembled Polymeric Pyridine Copper Catalysts for Huisgen Cycloaddition with Alkynes and Acetylene Gas: Application in Synthesis of Tazobactam
作者:Hao Hu、Aya Ohno、Takuma Sato、Toshiaki Mase、Yasuhiro Uozumi、Yoichi M. A. Yamada
DOI:10.1021/acs.oprd.8b00429
日期:2019.4.19
Novel convoluted polymeric pyridine copper(I) catalysts PVPy-Cu were developed for the Huisgen cyclization of organic azides using alkynes and acetylene gas. They were readily prepared based on our molecular convolution of CuSO4·5H2O and poly(4-vinylpyridine) (PVPy) in the presence of sodium ascorbate with and without various sodium salts in water. Their structural investigation was conducted using
Microwave Irradiation as an Effective Means of Synthesizing Unsubstituted N-Linked 1,2,3-Triazoles from Vinyl Acetate and Azides
作者:Henrik Jensen、Signe Hansen
DOI:10.1055/s-0029-1218366
日期:2009.12
N-Linked 1,2,3-triazoles have been prepared by a reaction of azides with vinyl acetate under microwave irradiation. Additionally, a microwave-assisted, two-step, one-pot procedure fromhalides involving azide substitution in diethyl ether, followed by reaction with vinyl acetate, has effectively been employed.
Easy One-Pot Synthesis of 1-Monosubstituted Aliphatic 1,2,3-Triazoles from Aliphatic Halides, Sodium Azide and Propiolic Acid by a Click Cycloaddition/Decarboxylation Process
作者:Zhongkui Zhang、Chunxiang Kuang
DOI:10.1002/cjoc.201300155
日期:2013.8
1‐Monosubstituted aliphatic 1,2,3‐triazoles were synthesized by a one‐pot reaction fromaliphatichalides (Cl and Br), sodiumazide and propiolicacid. The yields ranged from moderate to good. The reaction was easily carried out in DMF with Cs2CO3 at 100°C by copper‐catalyzed clickcycloaddition/decarboxylation.
通过单锅反应由脂肪族卤化物(Cl和Br),叠氮化钠和丙酸合成1-单取代的脂肪族1,2,3-三唑。产量从中等到良好。通过铜催化的点击环加成/脱羧反应,可以轻松地在100°C下于Cs 2 CO 3的DMF中进行反应。