An efficient and improved procedure for preparation of triflyl azide and application in catalytic diazotransfer reaction
作者:Ri-Bai Yan、Fan Yang、Yanfen Wu、Li-He Zhang、Xin-Shan Ye
DOI:10.1016/j.tetlet.2005.10.103
日期:2005.12
An efficient and improved procedure for preparation of triflyl azide and application in catalytic diazotransfer reaction are described. The amount of highly toxic reagents NaN3 and Tf2O, is significantly reduced comparing with the previous protocol.
作者:Serkos A. Haroutounian、Minas P. Georgiadis、John C. Bailar
DOI:10.1016/s0020-1693(00)85863-6
日期:1986.7
Synthesis of neamine-based pseudodisaccharides as potential vestibulotoxic agents to treat vertigo in Ménière’s disease
作者:Flávio Roberto Pinsetta、Daniel Fábio Kawano、Marcelo Rodrigues de Carvalho、José Antônio A. de Oliveira、Alexandre P. Corrado、Miguel Ângelo Hyppolito、Ivone Carvalho
DOI:10.1016/j.carres.2013.03.019
日期:2013.5
Meniere's disease (MD) is a progressive disease of the inner ear characterized by recurring attacks of disabling vertigo, hearing loss and tinnitus. Patients who do not respond to vestibular sedatives or steroids may require an intratympanic application of aminoglycoside antibiotics, which destroys the vestibular function of the affected ear in order to avoid the debilitating vertigo attacks. Although effective, this procedure causes hearing loss in almost one third of the patients due to the aminoglycosides cochlear toxicity. Here we describe the synthesis of two pseudodisaccharides structurally related to neamime aiming to mimic the aminoglycosides pharmacophore core by replacing their toxic amine by azide and hydroxyl groups. Products 1 and 2 selectively promoted 'in vivo' damage to vestibular tissues without causing hearing loss or cochlear toxicity. Therefore, these pseudodisaccharides stand as promising lead compounds for the development of a safer and more effective therapeutic procedure to manage the symptoms of MD severe dizziness. (C) 2013 Elsevier Ltd. All rights reserved.