Synthesis of 3-Deoxy-3-C-Trifluoromethyl-d-Ribose Fromd-Xylose ord-Glucose
摘要:
The synthesis of 3-deoxy-1,2-O-isopropylidene-3-C-trifluoromethyl-alpha-D-ribofuranose is described. After a first approach from a commercial D-xylose derivative which was limited by an incomplete stereoselectivity, the synthesis of the title compound was performed from 1,2:5,6-di-O-isopropylidene-alpha-D-glucofuranose by a reaction sequence where key steps: trifluoromethylation with CF(3)SiMe(3) and radical deoxygenation are highly stereoselective.
Unprecedented 3- O -methyl-3- C -trifluoromethyl- d -ribono- (and l -lyxono)-γ-lactones synthesized by nucleophilic trifluoromethylation of d -hexose-derived cyclic ketones
d-ribono-(and l-lyxono)-γ-lactones have been prepared from protected d-hexoses (gluco, galacto) by multi-step routesfromd-glucose. The synthetic strategy includes the following steps: regioselective oxidation, nucleophilic trifluoromethylation with the Ruppert-Prakash reagent of 3-keto hexofuranose derivatives attacked stereoselectively from the less hindered face, protective group manipulations
3- ø -甲基-3- Ç三氟甲基- d -ribono-(和升-lyxono)-γ-内酯已经从保护制备d -hexoses(葡萄糖,半乳糖)通过从多步途径d -葡萄糖。合成策略包括以下步骤:区域选择性氧化,3-酮基六呋喃糖衍生物的Ruppert-Prakash试剂的Ruppert-Prakash试剂进行亲核三氟甲基化,从较少受阻的面部进行立体选择性攻击,保护基操作和半缩醛羟基的区域选择性氧化。两种相关的d-核糖内酯的碱催化水解得到3 - O -Me-3- C-CF 3 - d -ribonic酸。
WO2007/113538
申请人:——
公开号:——
公开(公告)日:——
Stereoselectivity of the nucleophilic F-alkylation of carbonylated carbohydrates
The addition of F-alkyl organometallics to carbonylated carbohydrates 1-3 was carried out using trimethylsilyl or bromomagnesium reagents. The results are strongly dependent upon both the nature of the metal and of the substrate. Compounds 1 and 2 were transformed with high stereoselectivity into the L-ido adduct using F-organomagnesium reagents, whereas the D-allo adduct was obtained with complete stereoselectivity using fluoride activated addition of F-organosilanes on compound 3. Comparison with literature data emphasizes the enhanced stereoselectivity exhibited by perfluoroorgoanometallic reagents. The difference between the stereoselectivity of the addition of magnesium versus silyl reagents was attributed to chelation effects. (C) 1998 Elsevier Science Ltd. All rights reserved.
SUBSTITUTED ADENINES AND THE USES THEREOF
申请人:AstraZeneca AB
公开号:EP2010553A1
公开(公告)日:2009-01-07
[EN] SUBSTITUTED ADENINES AND THE USES THEREOF<br/>[FR] ADÉNINES SUBSTITUÉES ET LEUR UTILISATION
申请人:ASTRAZENECA AB
公开号:WO2007113538A1
公开(公告)日:2007-10-11
[EN] This invention relates to compounds of Formula (I) or Formula (II): their intermediates and the use of compounds of Formula (I) or Formula (II) in the treatment of bacterial infections. [FR] La présente invention concerne des composés répondant à la formule (I) ou à la formule (II), leurs intermédiaires et l'utilisation de composés répondant à la formule I ou à la formule II dans le traitement d'infections bactériennes.