通过反应,分别制备了新的笨重的三(三甲基甲硅烷基)甲硅烷基硼酸酯频哪醇和己二醇酯((TMS)3 Si–B(pin)和(TMS)3 Si–B(hg))。三(三甲基甲硅烷基)甲硅烷基钾与相应的硼亲电子试剂。值得注意的是,这些甲硅烷基硼酸酯在空气和硅胶中表现出很高的稳定性,可用于芳烃卤化物的无过渡金属硼取代,从而以高收率提供所需的硼化产物,并具有出色的B:Si比(高达96%的收率, B / Si = 99/1)。这些新的甲硅烷基硼酸酯还用于与各种芳基卤化物进行的顺序硼酸化/交叉偶联过程,以及用于苯乙烯的碱介导的硅烷化反应。
Clickable coupling of carboxylic acids and amines at room temperature mediated by SO<sub>2</sub>F<sub>2</sub>: a significant breakthrough for the construction of amides and peptide linkages
作者:Shi-Meng Wang、Chuang Zhao、Xu Zhang、Hua-Li Qin
DOI:10.1039/c9ob00699k
日期:——
carboxylic acids with amines was developed for the synthesis of a broad scope of amides in a simple, mild, highly efficient, robust and practical manner (>110 examples, >90% yields in most cases). The direct click reactions of acids and amines on a gram scale are also demonstrated using an extremely easy work-up and purification process of washing with 1 M aqueous HCl to provide the desired amides in
HMF and furfural: Promising platform molecules in rhodium-catalyzed carbonylation reactions for the synthesis of furfuryl esters and tertiary amides
作者:Xinxin Qi、Rong Zhou、Han-Jun Ai、Xiao-Feng Wu
DOI:10.1016/j.jcat.2019.11.008
日期:2020.1
esters and tertiary amides has been developed. 5-Hydroxymethylfurfural (HMF) was used as both substrate and CO surrogate for the first time in a carbonylation reaction, and both alkyl and aryl iodides were tolerated well to afford the desired furfuryl esters in moderate to good yields. In addition, furfural was also utilized as a CO source for the synthesis of tertiary amides. A variety of tertiary amides
A palladium-catalyzed N-acylation of tertiary amines by carboxylic acids was achieved through C–N cleavage. This reaction showed a wide substrate scope. Both aromatic and aliphatic acids served well as the acylating reagents and coupled with tertiary amines to produce the corresponding amides in good to excellent yields. With the strategy, bioactive carboxylic acids were also efficiently modified,
Efficient Cross-Coupling of Aryl Chlorides with Arylzinc Reagents Catalyzed by Amido Pincer Complexes of Nickel
作者:Li Wang、Zhong-Xia Wang
DOI:10.1021/ol701927g
日期:2007.10.1
The nickel-catalyzed Negishi cross-coupling reaction of arylchlorides with arylzinc compounds was investigated. The nickel complexes with the amido pincer type of ligands exhibited high catalytic activity and good functional group tolerance.
The Hiyama Cross‐Coupling Reaction at Parts Per Million Levels of Pd: In Situ Formation of Highly Active Spirosilicates in Glycol Solvents
作者:Shun Ichii、Go Hamasaka、Yasuhiro Uozumi
DOI:10.1002/asia.201901155
日期:2019.11.4
A palladium NNC-pincer complex at a 5 mol ppm loading efficiently catalyzed the Hiyama coupling reaction of aryl bromides with aryl(trialkoxy)silanes in propylene glycol to give the corresponding biaryls in excellent yields. This method was applied to the syntheses of adapalene and a biaryl-type liquid-crystalline compound, as well as to the derivatization of dextromethorphan and norfloxacin. ESI-MS