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。
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。
An improved method for the synthesis of anhydroalditols
作者:Arlen Jeffery、Vasu Nair
DOI:10.1016/0040-4039(95)00618-m
日期:1995.5
An improvedsynthesis of anhydroalditols through reductive cleavage of acetylated carbohydrates is reported. The procedure appears to have generality. Ring rearrangements, which complicate some other reported procedures for the preparation of anhydroalditols, were not observed. The acetate protecting groups used were stable under the reaction conditions employed.
Stereochemical aspects of catalytic siloxymethylation of various oxygen-containing compounds with hydrosilanes and carbon monixide in the presence of hydrosilanes and carbon monoxide in the presence of dicobalt octacarbonyl
Siloxymethylation of oxygen-containing compounds by a new catalytic reaction, HSiR3/COCo2(CO)8, is described with emphasis laid on stereoselectivity. In the catalytic reaction, the carbon-oxygen bond in the substrates is cleaved and displaced by a trialkylsiloxymethyl group. The siloxymethylation takes place with inversion, racemization, or retention at the reaction sites, depending on the structure
Scope of the directed dihydroxylation: application to cyclic homoallylic alcohols and trihaloacetamides
作者:Timothy J. Donohoe、Lee Mitchell、Michael J. Waring、Madeleine Helliwell、Andrew Bell、Nicholas J. Newcombe
DOI:10.1039/b303081d
日期:——
The synthesis and directed dihydroxylation of a range of cyclic alkenes was investigated. Both homoallylic alcohols and homoallylic trihaloacetamides were found to be efficient directing groups, giving rise to good to excellent levels of remote asymmetric induction with OsO4–TMEDA. Interestingly, in all cases examined, trifluoroacetamides were found to be superior to trichloroacetamides as directing groups and an argument is presented which rationalises this observation.
Abstract Dehydration of pentitols in acetic acid containing an acidic catalyst parallels that in aqueous sulfuric acid; 1,4(2,5)-dehydration occurs with inversion of configuration at C-2 or C-4. Acetylated alditols undergo similar processes via intermediates having free hydroxyl groups. Configurational inversion of 1,4- or 1,5-anhydroalditols is attributed to intermediate acyloxonium ions that are
B-vitamin and amino acid conjugates of nicotinoyl ribosides and reduced nicotinoyl ribosides, derivatives thereof, and methods of preparation thereof
申请人:ChromaDex Inc.
公开号:US10934322B2
公开(公告)日:2021-03-02
The present disclosure provides nicotinate/nicotinamide riboside compounds or derivatives of formula (I):
wherein X−, Z1, Z2, n, R1, R2, R3, R4, R5, R6, R7, and R8 are described herein, reduced analogs thereof, and synthetic processes for the preparation thereof.