Tuning the Topological Landscape of DNA–Cyclodextrin Nanocomplexes by Molecular Design
作者:Tania Neva、Ana I. Carbajo‐Gordillo、Juan M. Benito、Hugo Lana、Gema Marcelo、Carmen Ortiz Mellet、Conchita Tros de Ilarduya、Francisco Mendicuti、José M. García Fernández
DOI:10.1002/chem.202002951
日期:2020.11.26
Original molecular vectors that ensure broad flexibility to tune the shape and surface properties of plasmid DNA (pDNA) condensates are reported herein. The prototypic design involves a cyclodextrin (CD) platform bearing a polycationic cluster at the primary face and a doubly linked aromatic module bridging two consecutive monosaccharide units at the secondary face that behaves as a topology‐encoding
Per[6-deoxy-6-(4,5-dicarboxy-1,2,3-triazol-1-yl)-2,3-di-O-methyl] substituted α- and β-cyclodextrins 6a and 6b were prepared by 1,3-dipolar cycloaddition reaction of the corresponding per(6-azido-6-deoxy-2,3-di-O-methyl)cyclodextrins 4a and 4b with dimethyl acetylenedicarboxylate.
Facile preparation of a symmetric hexavalent oleanolic acid/per- O -methylated α -cyclodextrin conjugate with two conformations in solution and unambiguous NMR analysis
13C NMR, COSY, HSQC, HMBC, TOCSY, NOE, and ROESY experiments were performed. Detailed investigations revealed that the compound has two conformations in solution and the ratio of them was 1:1. Further variable-temperature NMR study revealed that the two conformations were stable at temperature range of 273–323 K in CDCl3 solution.
新合成的六价齐墩果酸/全-O-甲基化的α-环糊精共轭物与先前合成的类似物在NMR光谱中显示出显着差异。进行了1 H NMR,13 C NMR,COSY,HSQC,HMBC,TOCSY,NOE和ROESY实验的产物表征。详细的研究表明该化合物在溶液中有两个构象,它们的比例为1:1。进一步的变温NMR研究表明,这两种构象在CDCl 3溶液中在273–323 K的温度范围内是稳定的。
New Scaffolds for Supramolecular Chemistry: Upper-Rim Fully Tethered 5-Methyleneureido-5′-methyl-2,2′-bipyridyl Cyclodextrins
Seven upper-rim fully tethered cyclodextrins (URFT-CDs) have been synthesised in a good average coupling yield using the one-step "phosphine imide" approach and their metal complexation behaviour with lanthanides and transition metals was explored. We observed that the A-TE-E light conversion process (antennae effect) occurs in the URFT-CD lanthanide complexes. A molecular re ox switch based on the corresponding iron complexes is also reported. A reversible intramolecular translocation of the Fe-II and Fe-III ions, between two distinct binding cavities has been monitored spectroscopically and achieved by chemical triggering, Finally, a negative allosteric control of ion recognition through the formation of a CD pseudocryptand is discussed.
Reddy, L. Rajender; Reddy, M. Arjun; Bhanumathi, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2002, vol. 41, # 3, p. 645 - 646
作者:Reddy, L. Rajender、Reddy, M. Arjun、Bhanumathi、Rama Rao