Autoinducer compounds which enhance gene expression in a wide variety of microorganisms, therapeutic compositions and therapeutic methods wherein gene expression within microorganisms is regulated are disclosed.
A new entry for the oxidation of fluoroalkyl-substituted methanol derivatives: Scope and limitation of the organoiodine(V) reagent-catalyzed oxidation
作者:Yusuke Tanaka、Takashi Ishihara、Tsutomu Konno
DOI:10.1016/j.jfluchem.2012.03.002
日期:2012.5
Oxidation of various fluoroalkyl-substituted methanol derivatives under the influence of a catalytic amount of sodium 2-iodobenzenesulfonate and Oxone® in CH3CN or CH3NO2 was investigated in detail. The efficiency of the newly developed oxidation was also evaluated by comparison to other oxidations, such as Dess–Martin, PDC, and Swern oxidation.
钠2-碘和过硫酸氢钾的催化量的影响下的各种氟烷基取代甲醇衍生物的氧化®在CH 3 CN或CH 3 NO 2详细进行了研究。通过与其他氧化方法(如Dess-Martin,PDC和Swern氧化方法)进行比较,还评估了新开发的氧化方法的效率。
Asymmetric aldol addition of aldehydes to a difluoroketene silyl acetal catalyzed by chiral Lewis acids
substoichiometric amount of chiral Lewis acid 2 or 3 provides the corresponding α,α-difluoro β-hydroxyesters 4–12 with high enantioselectivities (up to 98% ee). Reaction temperature has a great influence on the enantiofacial selection of aldehydes; the reactions of benzyloxyacetaldehyde catalyzed by Lewis acid 2 at −78 and −30°C gave the (+)- and (−)-α,α-difluoro β-hydroxyesters 7 in optical yields of 98% and
Synthesis and Antifungal Activity of Rhodopeptin Analogues. 2. Modification of the West Amino Acid Moiety
作者:Kiyoshi Nakayama、Haruko C. Kawato、Hiroaki Inagaki、Ryohei Nakajima、Akihiro Kitamura、Kazuhiko Someya、Toshiharu Ohta
DOI:10.1021/ol005630k
日期:2000.4.1
[GRAPHICS]Structure-activity relationships of the west amino acid modified analogues of rhodopeptins, novel antifungal tetrapeptide isolated from Rhodococcus species Mer-N1033, have been investigated, Among the analogues synthesized, 2,2-difluoro and 2-hydroxy derivatives retained the antifungal activity with better physical properties, i.e., solubility or acute toxicity.
Novel synthetic analogs of the Pseudomonas autoinducer
作者:T. Kline、J. Bowman、B.H. Iglewski、T. de Kievit、Y. Kakai、L. Passador
DOI:10.1016/s0960-894x(99)00626-5
日期:1999.12
Release of virulence factors in Pseudomonas aeruginosa is regulated by two N-acylhomoserine lactones, PAI-I and PAI-2, that activate the respective transcription factors LasR and RhlR. With the goal of developing novel therapeutic agents, we synthesized constrained analogs of PAI-I and evaluated them in P. aeruginosa, Two of the novel analogs bound to LasR and showed agonist activity in LasR stimulation of a lasI-lacZ reporter construct. (C) 1999 Elsevier Science Ltd. All rights reserved.