Efficient Benzylic and Aliphatic C–H Oxidation with Selectivity for Methylenic Sites Catalyzed by a Bioinspired Manganese Complex
作者:Duyi Shen、Chengxia Miao、Shoufeng Wang、Chungu Xia、Wei Sun
DOI:10.1021/ol4037083
日期:2014.2.21
A benzimidazole-based nonheme manganese complex efficiently catalyzes benzylic, aliphatic C–H as well as tertiary C–H oxidation with hydrogen peroxide as the oxidant in the presence of acetic acid as additive. 18O labeling experiments suggest the reaction may proceed via a high-valent manganese-oxo intermediate.
Correlating ionic liquid solvent effects with solvent parameters for a reaction that proceeds through a xanthylium intermediate
作者:Alyssa Gilbert、Götz Bucher、Ronald S. Haines、Jason B. Harper
DOI:10.1039/c9ob01807g
日期:——
nucleophilic substitution reaction that proceeds through a xanthylium carbocation was studied in seven ionicliquid solvents. It was found that the general trend in the rate constant with changing proportion of ionicliquid in the reaction mixture was different to that seen for other unimolecular processes, with the rate constant increasing as more ionicliquid was added to the reaction mixture. A significant
作者:Paul E. Bender、Carl D. Perchonock、William G. Groves、Robert C. Smith、Orum D. Stringer、Rayvon Sneed、Jack H. Schlosser、Linda S. Hostelley、Bruce Y. H. Hwang
DOI:10.1021/jm00363a003
日期:1983.9
9H-xanthen-9-amines possessing a wide variety of nitrogensubstituents at C-9 was prepared for evaluation of gastric antisecretory activity. These substituents included the acetamidine, imidate, pyrimidine, thiazoline, quinuclidine, 2-hydrazinopyridine, aminopiperidine, aminoalkylimidazole, and aminoalkylpyridine moieties. The majority of compounds in this series inhibited gastric acid secretion when tested orally in
The compounds are N-(imidazolylalkyl, imidazolinylalkyl and tetrahydropyrimidylalkyl)-9-xanthenylamines which have gastric acid secretion inhibitory activity.