aerobic oxidative synthesis of 2-arylbenzo[d]oxazoles, 2-substituted benzo[d]thiazoles, and 1,2-disubstituted benzo[d]imidazoles. N-Heterocyclic carbene (NHC), generated in situ from easily available N-heterocyclic imidazolium salt with air as terminal oxidant, has successfully been utilized as a cheap and efficient catalyst for one-pot aerobic oxidative synthesis of 2-arylbenzo[d]oxazoles, 2-substituted
摘要 N-杂环卡宾(NHC)是由易获得的N-杂环咪唑盐以空气为末端氧化剂原位生成的,已成功地用作便宜且有效的一锅好氧氧化合成2-芳基苯并[ d ]恶唑的催化剂,2-取代的苯并[ d ]噻唑和1,2-二取代的苯并[ d ]咪唑。 N-杂环卡宾(NHC)是由易获得的N-杂环咪唑盐以空气为末端氧化剂原位生成的,已成功地用作便宜且有效的一锅好氧氧化合成2-芳基苯并[ d ]恶唑的催化剂,2-取代的苯并[ d ]噻唑和1,2-二取代的苯并[ d ]咪唑。
Deep eutectic solvent-catalyzed arylation of benzoxazoles with aromatic aldehydes
作者:Phuong Hoang Tran、Anh-Hung Thi Hang
DOI:10.1039/c8ra01094c
日期:——
A novel and efficient methodology for the arylation of benzoxazoles with aromaticaldehydes catalyzed by deep eutectic solvent has been developed. The reaction smoothly proceeded with a wide range of substrates to give the desired products in high yields within short reaction time. Deep eutectic solvents are easily recovered and reused without significant loss of catalytic activity.
Palladium-catalyzed deamidative arylation of azoles with arylamides through a tandem decarbonylation–C–H functionalization
作者:Chengliang Li、Pinhua Li、Jin Yang、Lei Wang
DOI:10.1039/c2cc18156h
日期:——
A highly chemo-, regio-selective, and efficient palladium-catalyzed deamidative arylation of azoles with arylamides, as an aryl metal equivalent, has been developed. The reaction proceeds smoothly to generate the corresponding products in good yields via a tandem decarbonylationâCâH activation.
Iodine-mediated arylation of benzoxazoles with aldehydes
作者:Yew Chin Teo、Siti Nurhanna Riduan、Yugen Zhang
DOI:10.1039/c3gc41027g
日期:——
A simple and efficient methodology for the arylation of benzoxazoles with aldehydes using iodine as the mediator has been developed. The reaction proceeded smoothly with a range of substrates to give the corresponding arylated products in moderate to good yields.
Phosphonium acidic ionic liquid: an efficient and recyclable homogeneous catalyst for the synthesis of 2-arylbenzoxazoles, 2-arylbenzimidazoles, and 2-arylbenzothiazoles
作者:Quang The Nguyen、Anh-Hung Thi Hang、Thuy-Linh Ho Nguyen、Duy-Khiem Nguyen Chau、Phuong Hoang Tran
DOI:10.1039/c8ra01709c
日期:——
A highly efficient and green strategy for the synthesis of 2-arylbenzoxazoles, 2-arylbenzimidazoles, and 2-arylbenzothiazoles catalyzed by phosphonium acidic ionic liquid has been developed via the condensation of o-aminophenol, o-phenylenediamines, and o-aminothiophenol, respectively, with aldehydes. The reaction has a good yield, the broad substrate scope, and mild condition. Triphenyl(butyl-3-s
分别通过邻氨基苯酚、邻苯二胺和邻氨基苯硫酚的缩合,开发了一种由鏻酸性离子液体催化合成 2-芳基苯并恶唑、2-芳基苯并咪唑和 2-芳基苯并噻唑的高效绿色策略,与醛。该反应收率好,底物范围广,条件温和。三苯基(丁基-3-磺酰基)鏻甲苯磺酸盐催化剂通过一锅法合成很容易从廉价且可用的起始材料中获得。其结构经1 H NMR、13 C NMR、31P NMR和FT-IR技术。热稳定性和酸度等其他性质采用TGA和Hammett酸度函数法测定。有趣的是,催化剂在第四次复苏之前仍能保持其持续的出色表现。