Synthesis of 1-deoxy-l-gulonojirimycin (l-guloDNJ) and 1-deoxy-d-talonojirimycin (d-taloDNJ)
摘要:
Carbohydrate based syntheses of azasugars with unusual configurations viz. 1,5-dideoxy-1,5-imino-L-gulitol (L-gulo DNJ) and 1,5-dideoxy-1,5-imino-L-talitol (L-talo DNJ) are reported, from D-mannose and D-fructose, respectively. The key steps in both syntheses involved reductive aminative cyclizations. Thus, L-gulo DNJ was obtained by reduction of 2,3;4,6-di-O-isopropylidene-5-O-p-toluenesulfonyl-D-mannononitrile with LiAlH4 in DME to give the protected azasugar which upon hydrolysis with HCl afforded crystalline L-guloDNJ as the HCl salt in 29% overall yield. Reduction of 6-azido-1-O-tert-butyldimethylsityl-2,3-O-isopropylidene-beta-D-ribohexulofuranose obtained from D-fructose in six steps, followed by treatment with HCl, afforded L-talo DNJ as an HCl salt in similar to10% overall yield. (C) 2002 Elsevier Science Ltd. All rights reserved.
[EN] BOLAAMPHIPHILIC COMPOUNDS, COMPOSITIONS AND USES THEREOF<br/>[FR] COMPOSITIONS, COMPOSÉS BOLAAMPHIPHILES, ET LEURS UTILISATIONS
申请人:LAUREN SCIENCES LLC
公开号:WO2016168580A1
公开(公告)日:2016-10-20
Bolaamphiphilic compounds are provided according to formula (I); where HG1, HG2 and L1 are as defined herein. Provided bolaamphiphilic compounds and the pharmaceutical compositions thereof are useful for delivering GDNF or NGF into animal or human brain.
A convergent approach toward fidaxomicin: Syntheses of the fully glycosylated northern and southern fragments
作者:Ryan Hollibaugh、Xueliang Yu、Jef K. De Brabander
DOI:10.1016/j.tet.2020.131673
日期:2020.12
future development of analogs with superior pharmacokinetics. We developed a robust approach to each of the key macrocyclic and sugar fragments, their union via stereoselective glycosylation, and a convergent late-stage macrolide formation with fully glycosylated fragments. Although we were able to demonstrate that the final Suzuki cross-coupling and ring-closing metathesis steps enabled macrocycle formation
N-acetyl-d-glucosamine, N-acetyl-d-galactosamine, d-glucose, d-galactose and d-mannose with a variety of alcohols (methanol, ethanol, benzylalcohol and allylalcohol). Remarkable acceleration of the glycosylation reactions (minutes compared to hours) over conventional reflux heating was observed with good yields and production of the α-glycoside as the dominant product.
Hydroxyazepanes as inhibitors of glycosidase and HIV protease
申请人:The Scripps Research Institute
公开号:US06462193B1
公开(公告)日:2002-10-08
Hydroxyazepanes display inhibitory activity with respect to glycosidase, with Ki values from-moderate to low micromolar range. Benzyl and 3,6-dibenzyl derivatives of hydroxyazepanes display inhibitory activity with respect to HIV protease. These compounds are synthesized either by chemoenzymatic or chemical methodologies.
NOVEL LIPIDS AND COMPOSITIONS FOR THE DELIVERY OF THERAPEUTICS
申请人:MANOHARAN Muthiah
公开号:US20120095075A1
公开(公告)日:2012-04-19
The present invention provides lipids that are advantageously used in lipid particles for the in vivo delivery of therapeutic agents to cells. In particular, the invention provides lipids having the following structure: