Photocatalytic Oxidative C–H Thiolation: Synthesis of Benzothiazoles and Sulfenylated Indoles
作者:Andrew N. Dinh、Ashley D. Nguyen、Ernesto Millan Aceves、Samuel T. Albright、Mario R. Cedano、Diane K. Smith、Jeffrey L. Gustafson
DOI:10.1055/s-0039-1690107
日期:2019.9
sulfenylated indoles via an intermolecular reaction. Cyclic voltammetry (CV) and density functional theory studies suggest that benzothiazole formation proceeds via a mechanism that involves an electrophilic sulfur radical, while the indole sulfenylation likely proceeds via a nucleophilic sulfur radical adding into a radical cationic indole. These conditions were successfully extended to several thiobenzamides
Chiral phosphoramidite–olefin hybrid ligands were found to be effective in the iridium-catalyzed asymmetric alkylation of N-arylbenzamides with vinyl ethers. The reaction is catalyzed by a hydroxoiridium catalyst coordinated with the hybrid ligand to give the corresponding products in high yields with high branch selectivity and enantioselectivity.
Mild Amide Synthesis Using Nitrobenzene under Neutral Conditions
作者:Ni Xiong、Yuanqi Dong、Bin Xu、Yang Li、Rong Zeng
DOI:10.1021/acs.orglett.2c01743
日期:2022.7.8
Amide synthesis is one of the most important transformations in organic chemistry due to the broad application in pharmaceutical drugs and organic materials. In this report, we describe a mild protocol for amide formation using the readily available nitroarenes as nitrogen sources and an inexpensive iron complex as a catalyst. Because of the use of the pH-neutral conditions and the avoidance of the
由于在药物和有机材料中的广泛应用,酰胺合成是有机化学中最重要的转化之一。在本报告中,我们描述了一种温和的酰胺形成方案,使用现成的硝基芳烃作为氮源和廉价的铁络合物作为催化剂。由于使用 pH 中性条件和避免强氧化剂或还原剂,可以很好地耐受各种芳香族和脂肪族醛以及具有各种官能团的硝基芳烃。在详细研究的基础上提出了一种合理的机制,其中铁催化剂引发自由基过程,溶剂作为 O 原子受体起关键作用。
DEVELOPER AND THERMOSENSITIVE RECORDING MATERIAL
申请人:Mitsubishi Chemical Corporation
公开号:EP4067340A1
公开(公告)日:2022-10-05
An object of the present invention is to provide: a developer that can provide a thermosensitive recording material excellent in color development sensitivity and storage stability; and a thermosensitive recording material obtained using the developer. The object is achieved by a developer including a compound represented by the following Formula (1).
(In Formula (1), a, A, and L are as follows: a is an integer selected from 1 to 5, A is each independently a fluoro group or a perfluoroalkyl group, and L is any of functional groups represented by the following Formula (2) :
wherein in Formula (2), R is a C1-C4 alkyl group, and * represents a binding site to a sulfur atom in Formula (1)).
A comparative study on the synthesis, stability, and catalytic activity of various iron pincer complexes with the general formula [(R-(PNP)-P-H)Fe(H) (CO) (BH4)] is reported, where R denotes the substituent of the terminal PR2-groups (R = Bu-t, Cy, Pt-i, Ph, Et). By the example of the synthesized precatalysts, it is shown that the nature of the ligands has a surprising influence on the catalytic properties of the complexes. Bulky ligands and less electron donating ligands affect the stability of the complexes, which preferably react under the loss of CO or H-2 to deactivated products. In return, the reduced steric demand and the strong sigma-donating properties of the Et-substituted precatalyst (2a) lead to an improved activity in the hydrogenation of esters to alcohols, compared to that of the previously reported Pr-i-substituted-complexes. The improved activity of complex 2a is clearly demonstrated in the direct hydrogenation of amides to alcohols and amines under mild conditions.