Transannulation of 1-Sulfonyl-1,2,3-triazoles with Heterocumulenes
作者:Stepan Chuprakov、Sen Wai Kwok、Valery V. Fokin
DOI:10.1021/ja400350c
日期:2013.3.27
reactions with isocyanates and isothiocyanates, respectively. The proposed triazole-diazoimine equilibrium results in the formation of highly reactive azavinyl metal-carbenes, which react with heterocumulenes causing an apparent swap of 1,2,3-triazole core for another heterocycle.
Identification of a Novel Series of<i>N</i>-Phenyl-5-[(2-phenylbenzimidazol-1-yl)methyl]-1,3,4-oxadiazol-2-amines as Potent Antioxidants and Radical Scavengers
作者:Gulgun Ayhan-Kilcigil、Canan Kuş、Tülay Çoban、Elcin D. Özdamar、Benay Can-Eke
DOI:10.1002/ardp.201300324
日期:2014.4
In this study, some novel 5‐[[2‐(phenyl/p‐chlorophenyl)‐benzimidazol‐1‐yl]‐methyl]‐N‐substituted phenyl‐1,3,4‐oxadiazol‐2‐amine derivatives (28–45) with an oxadiazole ring were synthesized. The antioxidant properties and radical scavenging activities of the compounds were investigated employing various in vitro systems: hepatic microsomal NADPH‐dependent inhibition of lipid peroxidation levels, scavenging
of the indoleamine 2,3-dioxygenase (IDO), a promising therapeutic target for anticancer immunotherapy, a series of 32 phenylthiosemicarbazide derivatives was prepared and their IDO inhibition evaluated. Our study demonstrated that among these derivatives, compound 14 characterized with a 4-cyanophenyl group on the thiosemicarbazide was the more potent IDOinhibitor in this series being endowed with an
Structure–activity relationship of dihydroimidazo-, dihydropyrimido, tetrahydrodiazepino-[2,1-b]-thiazoles, and -benzothiazoles as an acylation catalyst
synthesized by a condensation reaction of cyclic thioureas 15 and α-bromoacetophenones 14. Investigations of the acylation reactions of 1-phenylethanol with acid anhydrides in the presence of these cyclic isothiourea catalysts revealed their structure–activity relationships. Remarkable electronic effects resulting from substituent(s) on a benzo or phenyl moiety and the influence of the size of the annulating
Non-biaryl atropisomers derived from carbohydrates. Part 1. Stereoselective synthesis of 1-aryl-5-hydroxyimidazolidine-2-thiones and their transformation into imidazoline-2-thiones
作者:Martín Avalos、Reyes Babiano、Pedro Cintas、JoséL Jiménez、Juan C Palacios、Guadalupe Silvero、Concepción Valencia
DOI:10.1016/s0040-4020(99)00109-x
日期:1999.4
of this type of structures having a cis configuration (S at C-5) is also described. Moreover, the mechanistic features associated with the conversion of 5-acetoxyimidazolidine-2-thiones into imidazoline-2-thiones have also been evaluated.