The bis-1,4-dimesityl-1,2,3-triazol-5-ylidene–palladium complex (1a) successfully catalyzes the Mizoroki–Heck and Sonogashira coupling reactions with aryl bromides to give the corresponding alkenes and alkynes, respectively, in good to excellent yields. In the Mizoroki–Heck reaction, electron-rich, electron-poor, and functionalized aryl bromides and alkenes are tolerated, while the substrates are limited
Selective Construction of C−C and C=C Bonds by Manganese Catalyzed Coupling of Alcohols with Phosphorus Ylides
作者:Xin Liu、Thomas Werner
DOI:10.1002/adsc.202001209
日期:2021.2.16
manganese catalyzed coupling of alcohols with phosphorus ylides. The selectivity in the coupling of primary alcohols with phosphorus ylides to form carbon‐carbon single (C−C) and carbon‐carbon double (C=C) bonds can be controlled by the ligands. In the conversion of more challenging secondary alcohols with phosphorus ylides the selectivity towards the formation of C−C vs. C=C bonds can be controlled by the
Enantioselective Aziridination Using Copper Complexes of Biaryl Schiff Bases
作者:Kevin M. Gillespie、Christopher J. Sanders、Paul O'Shaughnessy、Ian Westmoreland、Christopher P. Thickitt、Peter Scott
DOI:10.1021/jo025515i
日期:2002.5.1
Racemic2,2'-diamino-6,6'-dimethylbiphenyl is resolved using simulated moving bed chromatography, and the absolute configuration of the enantiomers is confirmed via the X-ray crystal structure of a derivative. The diamine is condensed with a range of aldehydes to give bidentate aldimine proligands L. Molecular structures of the complexes formed between L and Cu(I) fall into two classes; bimetallic
An efficient palladium catalyzed Mizoroki–Heck cross-coupling in water
作者:Sanjay N. Jadhav、Chandrashekhar V. Rode
DOI:10.1039/c7gc02869e
日期:——
Pd-catalysed Mizoroki–Heck coupling reaction was successfully performed in water in the absence of any additives under aerobic conditions. The various key reaction parameters that affect the yield of the desired cross-coupling product were optimized. The Pd(PPh3)4/Et3N/H2O/98 °C catalyst system was found to be highly active (TOF = 12 to 14 h−1) towards achieving excellent yield of the Mizoroki–Heck coupling
在有氧条件下,在没有任何添加剂的情况下,水中成功地进行了均相Pd催化的Mizoroki-Heck偶联反应。优化了影响所需交叉偶联产物收率的各种关键反应参数。发现Pd(PPh 3)4 / Et 3 N / H 2 O / 98°C催化剂体系具有很高的活性(TOF = 12至14 h -1),可实现出色的Mizoroki–Heck偶联产物的收率。在最短的反应时间内,吸电子以及给电子的芳基溴化物和氯化物种类繁多。钯(PPh 3)4对Mizoroki-Heck偶联反应过程中的催化剂失活进行了研究,并发展了实现十倍Pd-金属可循环性而又没有明显损失其活性的策略。因此,提出的机制提供了在水性介质中接触各种烯烃的途径,从而使该协议变得环保。
One-Pot Enantioselective Aziridination of Olefins Catalyzed by a Copper(I) Complex of a Novel Diimine Ligand by Using PhI(OAc)2 and Sulfonamide as Nitrene Precursors
作者:Xisheng Wang、Kuiling Ding
DOI:10.1002/chem.200501109
日期:2006.6.2
A novel chiral C(2)-symmetric 1,4-diamine with multistereogenic centers at the backbone of the ligand has been synthesized from cheap natural product D-mannitol through multistep transformations. Its diimine derivative (3 a) was found to be highly effective for the enantioselective control of the copper-catalyzed asymmetric aziridination of olefin derivatives with PhI==NTs as the nitrene source, affording