Improved synthesis and application of conjugation-amenable polyols from <scp>d</scp>-mannose
作者:Ida Mattsson、Ruzal Sitdikov、Andreas C. M. Gunell、Manu Lahtinen、Tiina Saloranta-Simell、Reko Leino
DOI:10.1039/c9ra10378c
日期:——
thiol–ene and Huisgen click reactions. Conformational analysis by NMR spectroscopy proved that the intrinsic rigidity and linear conformation of the mannose derived polyol backbone is retained in the final click products in solution. Single crystal X-ray structure determination of one of the compounds prepared further verified that the linear conformation of the polyol segment is also retained in the
通过烯丙基和炔丙基D-甘露糖衍生物与选定的硫醇和叠氮化物在硫醇 - 烯和 Huisgen 点击反应中反应制备一系列多羟基硫化物和三唑。NMR光谱的构象分析证明,甘露糖衍生的多元醇骨架的固有刚性和线性构象保留在溶液中的最终点击产物中。对所制备的化合物之一的单晶 X 射线结构测定进一步证实了多元醇链段的线性构象也保持在固态。此外,一种改进的无保护D直接 Barbier 型炔丙基化方法报告了-甘露糖。新的反应方案涉及乙腈-水混合物中锡介导的炔丙基化,无需依赖保护基团操作或色谱纯化即可获得数克数量的所需的有价值的炔烃多元醇。
Thermal, Spectroscopic, and Crystallographic Analysis of Mannose-Derived Linear Polyols
racemic form has been conducted. The binary melting point diagram of the system was determined by differential scanning calorimetry analysis, and the obtained results, along with structure determination by single crystal X-ray diffraction, confirmed that allylated mannose forms a true racemate. Further examination by powder X-ray diffraction and CPMAS 13C NMR spectroscopy revealed polymorphism both in the
先前已证明在Barbier型金属介导的d-甘露糖烯丙基化反应中形成的主要非对映异构体在固态和溶液中均具有完美的线性构象,从而形成氢键网络并随后从水溶液中聚集。搅拌下溶解。在此,对烯丙基化的d-甘露糖及其外消旋形式的固态结构进行了全面研究。通过差示扫描量热法分析确定该系统的二元熔点图,并且获得的结果以及通过单晶X射线衍射确定的结构证实了烯丙基化的甘露糖形成了真正的外消旋体。通过粉末X射线衍射和CP MAS 13C NMR光谱进一步检查,发现纯对映体和外消旋体均具有多态性。另外,制备了烯丙基化的d-甘露糖的炔丙基化和氢化的类似物,并进行了热分析和光谱分析。成功确定了炔丙基化化合物的晶体结构,显示出与烯丙基化的d-甘露糖相似的线性分子构象。两种新化合物同样在水中表现出聚集行为,进一步证实了低能线性构象在这些棒状甘露糖衍生物的这种异常行为中起着重要作用。
Converting Unprotected Monosaccharides into Functionalised Lactols in Aqueous Media: Metal-Mediated Allylation Combined with Tandem Hydroformylation-Cyclisation
Schimid, Walther; Whitesides, George M., Journal of the American Chemical Society, 1991, vol. 113, # 17, p. 6674 - 6675
作者:Schimid, Walther、Whitesides, George M.
DOI:——
日期:——
Tsuji–Wacker-Type Oxidation beyond Methyl Ketones: Reacting Unprotected Carbohydrate-Based Terminal Olefins through the “Uemura System” to Hemiketals and α,β-Unsaturated Diketones
作者:Patrik A. Runeberg、Patrik C. Eklund
DOI:10.1021/acs.orglett.9b02134
日期:2019.10.18
Aerobic Pd(AcO)2/pyridine-catalyzed oxidation of unprotected carbohydrate-based terminal alkenes was studied. In accordance with previous reports, the initial reaction step gave methylketones. However, our substrates partially gave subsequent α,β-water elimination and alcohol oxidation to α,β-unsaturated 2,5-diketones. Upon increasing the pressure of O2, the reaction was shifted toward formation of