Palladium-Catalyzed Benzylation of Carboxylic Acids with Toluene via Benzylic C–H Activation
摘要:
Direct benzylation of carboxylic acids with toluene has been developed via palladium-catalyzed C-H acyloxylation under 1 atm of oxygen. This reaction demonstrates good functional group tolerance and high yields, providing a facile, atom-economic, and efficient method for the synthesis of benzyl esters.
The paper describes a cooperative NHC (N‐heterocyclic carbene) and ruthenium‐based redox catalysis for the mild aerobic oxidative esterification of various aromatic and heteroaromatic aldehydes. The ruthenium(II) complex Ru(bpz)3(PF6)2 (bpz=2,2′‐bipyrazine) as catalyst is shown to be compatible with free NHCs. The NHC is used in these cascade reactions for the umpolung of the aldehyde to form the corresponding
nickel-catalyzed alkoxycarbonylation of aromatic iodides with alcoholsunder atmospheric pressure of carbonmonoxide is presented here. This operationally simple protocol allows the facile synthesis of (hetero)aromatic esters, exhibiting broad substrate scope with excellent functional group tolerance. Various primary and secondary aliphatic alcohols as well as phenols are suitable for this transformation
A Visible‐Light Driven Esterification of Aldehydes Catalyzed by VOSO
<sub>4</sub>
作者:Silvia Gaspa、Luca Ledda、David d'Atri、Andrea Porcheddu、Luisa Pisano、Massimo Carraro、Lidia De Luca
DOI:10.1002/adsc.202201134
日期:2023.2.21
An esterification of the C−H bond of aldehydes promoted by oxidovanadium(IV) sulfate, VIVOSO4, is reported. The process is mediated by visible-light, is carried out at room temperature, in absence of additives and using H2O2 as a benign oxidant. VOSO4 is a commercially available, earth-abundant metal (EAMs) salt, that does not require to be prepared. This report opens intriguing perspectives for the
据报道,硫酸氧钒 (IV) 促进了醛的 C-H 键酯化,V IV OSO 4。该过程以可见光为媒介,在室温下进行,没有添加剂,使用 H 2 O 2作为良性氧化剂。VOSO 4是一种市售的地球储量丰富的金属 (EAM s ) 盐,无需制备。该报告为钒盐在卤化过程以及 C−H 活化中的扩展应用开辟了有趣的视角,并在地球丰富的金属基催化领域做出了贡献。
PROCESS FOR THE PREPARATION OF TRIAZINE DERIVATIVES
申请人:Japan Tobacco Inc.
公开号:EP3456713A1
公开(公告)日:2019-03-20
Provided is a process for the production of a compound represented by the formula [I] or a pharmaceutically acceptable salt thereof:
wherein each symbol is as defined in the specification. Said compound has an mPGES-1 inhibitory activity and is useful for the prophylaxis or treatment of pain, rheumatism, osteoarthritis, fever, Alzheimer's disease, multiple sclerosis, arteriosclerosis, glaucoma, ocular hypertension, ischemic retinal disease, systemic scleroderma and cancer including colorectal cancer.