Efficient “Dehomologation” of Di-O-isopropylidenehexofuranose Derivatives To Give O-Isopropylidenepentofuranoses by Sequential Treatment with Periodic Acid in Ethyl Acetate and Sodium Borohydride
The firsttotalsynthesis of ganglioside DSG-A (1) is achieved via chemoselective glycosylation and a [1 + 1 + 2] synthetic strategy. We have also developed an efficient method that can be handled on large scale (50 g) for the synthesis of the phytosphingosine.
NOVEL alpha-GALACTOSYL CERAMIDE ANALOGS AND USES THEREOF
申请人:Chang Gung Memorial Hospital, Linkou
公开号:US20160115188A1
公开(公告)日:2016-04-28
The present invention is directed to compounds of formula (I) and pharmaceutical compositions comprising compounds of formula (I) and pharmaceutically acceptable carriers. The invention further comprises improved process for the preparation of compounds of formula (I), and the use of compound of formula (I) to induce a specific immune response or to treat an autoimmune disease.
Prebiotic synthesis of aminooxazoline-5′-phosphates in water by oxidative phosphorylation
作者:C. Fernández-García、N. M. Grefenstette、M. W. Powner
DOI:10.1039/c7cc02183f
日期:——
the leading candidate for the first biopolymer of life. Aminooxazolines have recently emerged as key prebiotic ribonucleotide precursors, and here we develop a novel strategy for aminooxazoline-5′-phosphate synthesis in water from prebiotic feedstocks. Oxidation of acrolein delivers glycidaldehyde (90%), which directs a regioselective phosphorylation in water and specifically affords 5′-phosphorylated
approach for the synthesis of 1,2,3,5-tetraacetylcarba-alpha-D-lyxofuranose from D-ribose is reported via one-pot conversion of to usingTebbe reagent which involves a cascade reaction sequence of methylenation, cleavage of isopropyl group, carbocyclization and again methylenation.
Hp-s1 (1) which displays neuritogenic activity toward the rat pheochromocytoma cell line PC-12 cell in the presence of nervegrowthfactor (NGF) with an effect (34.0%) greater than that of the mammalian ganglioside GM 1 (25.4%), was accomplished by applying a chemoselective-activation glycosylation strategy. Moreover, we also demonstrate that the synthesized ganglioside 2 exhibited neuritogenic activity