Cationic Palladium(II) Catalysis: C−H Activation/Suzuki−Miyaura Couplings at Room Temperature
作者:Takashi Nishikata、Alexander R. Abela、Shenlin Huang、Bruce H. Lipshutz
DOI:10.1021/ja910973a
日期:2010.4.14
Cationic palladium(II) catalyst realized facile C-Hactivation of aryl urea with arylboronic acids at roomtemperature. This reaction is extremely mild to carry out aromatic C-Hactivations through electrophilic substitution.
Cationic Pd(II)-catalyzed C–H activation/cross-coupling reactions at room temperature: synthetic and mechanistic studies
作者:Takashi Nishikata、Alexander R Abela、Shenlin Huang、Bruce H Lipshutz
DOI:10.3762/bjoc.12.99
日期:——
Cationic palladium(II) complexes have been found to be highly reactive towards aromatic C-H activation of arylureas at room temperature. A commercially available catalyst [Pd(MeCN)4](BF4)2 or a nitrile-free cationic palladium(II) complex generated in situ from the reaction of Pd(OAc)2 and HBF4, effectively catalyzes C-H activation/cross-coupling reactions between aryl iodides, arylboronic acids and
One-pot synthesis of 2,3-difunctionalized indoles via Rh(<scp>iii</scp>)-catalyzed carbenoid insertion C–H activation/cyclization
作者:Honggui Lv、Jingjing Shi、Bo Wu、Yujuan Guo、Junjun Huang、Wei Yi
DOI:10.1039/c7ob01977g
日期:——
Reported herein is the first Rh(III)-catalyzedcarbenoidinsertionC–H activation/cyclization of N-arylureas and α-diazo β-keto esters. The redox-neutral reaction has the following features: good to excellent yields, broad substrate/functional group tolerance, exclusive regioselectivity, and no need for additional oxidants or additives, which render this methodology as a more efficient and versatile
Rhodium(<scp>iii</scp>)-catalyzed and MeOH-involved regioselective mono-alkenylation of N-arylureas with acrylates
作者:Honggui Lv、Jingjing Shi、Junjun Huang、Chao Zhang、Wei Yi
DOI:10.1039/c7ob01627a
日期:——
mono-alkenylation of arenes with acrylates using NHCONMe2 as the transformable directing group, giving direct access to diverse ortho-acrylated N-phenyl carbamates. The syntheticapplication of the obtained products to build privileged quinolin-2(1H)-ones and 3-(2-aminophenyl)acrylates has also been demonstrated in subsequent derivatization reactions.
Room Temperature CH Activation and Cross-Coupling of Aryl Ureas in Water
作者:Takashi Nishikata、Alexander R. Abela、Bruce H. Lipshutz
DOI:10.1002/anie.200905967
日期:2010.1.18
Just mix in water 'n stir: Pd‐catalyzed CH activation/cross‐couplings can be carried out at roomtemperature in water/surfactant mixtures. The combination of Pd(OAc)2 and HBF4 allowed for reactions of aryl ureas with aryl iodides under very mild conditions, using micellar catalysis (see scheme). This reaction is made possible by use of an in situ generated cationic palladium catalyst.
只需与水混合并搅拌即可:Pd 催化的 C - H 活化/交叉偶联可以在室温下在水/表面活性剂混合物中进行。Pd(OAc) 2和HBF 4的组合允许芳基脲与芳基碘化物在非常温和的条件下使用胶束催化进行反应(参见方案)。通过使用原位产生的阳离子钯催化剂使该反应成为可能。