大量天然存在的碳水化合物及其手性和结构的多样性导致了对基于碳水化合物的 IL 进行系统研究的想法。为此,我们研究了不同醚基(主要是甲基或乙基醚)对仲 OH 基团的影响,以及不同构型对物理性质(如熔点、热稳定性,尤其是对细胞毒性的影响)的影响。在本次调查中,我们选择了 α-和 β-甲基-、β-烯丙基-和 β-苯基D-吡喃葡萄糖以及四种 1-脱氧戊糖。为了能够对结果进行分类,检查了更多具有不同结构动机的离子液体的细胞毒性。在这里,我们提供的数据证实了这种由天然分子或其衍生物组成的 ILs 的生物相容性。测试了合成的基于碳水化合物的 ILs 作为药物洗脱球囊等医疗应用涂层添加剂的适用性。
[EN] DEHYDRATIVE CYCLIZATION OF PENTITOLS USING WATER-TOLERANT LEWIS ACID CATALYSTS UNDER MILD CONDITIONS AND DERIVATIVES<br/>[FR] CYCLISATION PAR DÉSHYDRATATION DE PENTITOLS À L'AIDE DE CATALYSEURS DE TYPE ACIDE DE LEWIS TOLÉRANTS À L'EAU DANS DES CONDITIONS DOUCES, ET DÉRIVÉS CORRESPONDANTS
申请人:ARCHER DANIELS MIDLAND CO
公开号:WO2017030684A1
公开(公告)日:2017-02-23
A catalytic process for the dehydrative cyclization of pentitols to synthesize anhydropentitols is described. Water-tolerant Lewis acids (in particular, metal triflates) are employed as catalysts to improve conversion and anhydropentitol selectivity at ultra-low catalyst loadings. The process can produce cyclic ether triols in high yields with concurrent complete pentitol conversion.
A series of novel xylitan derivatives derived from xylitol were synthesized using operationally simple procedures. A xylitan acetonide was the key intermediate used to prepare benzoate, arylsulfonate esters and 1,2,3-triazole derivatives of xylitan. These compounds were evaluated for their in vitro anti-Trypanosoma cruzi activity against trypomastigote and amastigote forms of the parasite in T. cruzi-infected
Abstract The products of dehydration of pentitols in aqueous sulfuric acid have been studied by g.l.c.-m.s. Four isomeric 1,4-anhydropentitols were formed from d -arabinitol, but only two from xylitol and ribitol. The number of products could only be explained by assuming inversion of configuration at C-2 or C-4 during 1,4- or 2,5-cyclisation reactions. No product which involved inversion of configuration