Synthesis and Evaluation of a Pseudocyclic Tristhiourea-Based Anion Host
摘要:
A novel methodology for the evaluation of receptor arrangement in structurally flexible anion chemosensors was developed and applied to map the binding site of a new pseudocyclic tristhiourea chemosensor ( 6). The syntheses of 6 and related macrocyclic chemosensor 10 ( a model of the folded monomeric structure of 6) are reported. Both chemosensors were evaluated by titration with a variety of structurally different anions in CH3Cl and DMSO, showing a common preference for F-, CH3CO2-, and H2PO4-. However, within this group of anions, the binding patterns of the chemosensors differed, indicating dissimilarity in the arrangement of the binding sites of 6 and 10.
EIGHT-ARM POLYETHYLENE GLYCOL DERIVATIVE, PRODUCTION METHOD THEREFOR, AND MODIFIEDBIO-RELATEDSUBSTANCETHEREOF
申请人:XIAMEN SINOPEG BIOTECH CO., LTD
公开号:US20180214561A1
公开(公告)日:2018-08-02
Disclosed are an eight-arm polyethylene glycol (PEG) derivative (formula I), production method therefor and modified bio-related substance thereby. Wherein, one tetravalent group U together with four trivalent groups E
c
form a highly symmetrical octavalent group CORE
0
; L
c
connects the octavalent group to eight PEG chains having polydispersity or monodispersity and having n
1
to n
8
as the degree of polymerization thereof; the terminal of one PEG chain is connected to at least one functional group F (k≥1); said PEG chain and F therebetween can be directly connected (g=0) or be indirectly connected via a linking group L
0
to a terminal end-branching group G (g=1); the latter provides more reactive sites for binding more drug molecules and increases the drug loading. The eight-arm polyethylene glycol derivative has a centrosymmetric or approximately centrosymmetric structure, and leads to more precise control of the molecular weight in large-scale production and much narrower distribution of molecular weight for products. The modified bio-related substance thereby has a more uniform and controllable performance.