Preparation of macrocyclon analogues: calix[8]arenes with extended polyethylene glycol chains
摘要:
A one-pot methodology has been developed for the preparation of macrocyclon mimics, i.e., calix[8]arenes containing hydrophobic alkyl substituents on the upper rim and hydrophilic polyethylene glycol chains on the lower rim. Compounds containing PEG chains of up to 24 repeating ethylene oxide (EO) units can be prepared. With increasing molecular weight, these amphiphilic compounds can be classified as macromolecules, and can be difficult to characterise as single molecules. The limitations of conventional analytical techniques are discussed. (c) 2007 Elsevier Ltd. All rights reserved.
Multigram Synthesis of Well-Defined Extended Bifunctional Polyethylene Glycol (PEG) Chains
摘要:
A series of novel, well-defined, unsymmetrical poly(ethylene glycol) chains of the type X(OCH2CH2)(n)Y (where X = protecting group; Y = nucleofuge or a different protecting group; n = 3, 6, 9, 12, 15, 18, and 24) were prepared in high yields by applying orthogonal protecting groups. The purity of the compounds was fully verified by elemental and high-resolution mass spectrometry analyses.
There are provided according to the invention compounds of the formula (I) or a salt or solvate thereof, wherein: n represents an integer 1 to 6; N represents an integer 1 to 15; R
1
represents (CO)
x
C
1-9
alkyl or (CO)
x
C
1-9
fluoroalkyl, which fluoroalkyl moiety contains at least 1 fluorine atom and not more than 3 consecutive perfluorocarbon atoms wherein x represents 0 or 1; and R
2
and R
3
independently represent C
1-3
alkyl or hydrogen. There are also provided pharmaceutical aerosol formulations employing said compounds as suspension stabilising agents.
Compounds of formula (I):
and uses of such compounds are described.
描述了化学式为(I)的化合物及其用途。
Alkanoic acid derivatives
申请人:SmithKline Beecham Corporation
公开号:US07217409B2
公开(公告)日:2007-05-15
A method for treating respiratory disorders comprises administering to a patient a pharmaceutical aerosol formulation comprising: (i) a compound of formula (I)
or a salt or solvate thereof, wherein:
n represents an integer 1 to 6;
N represents an integer 1 to 15;
R1 represents —(CO)xC1-9 alkyl or —(CO)xC1-9 fluoroalkyl, which fluoroalkyl moiety contains at least 1 fluorine atom and not more than 3 consecutive perfluorocarbon atoms
wherein x represents 0 or 1; and
R2 and R3 independently represent C1-3alkyl or hydrogen, (ii) at least one medicament, and (iii) at least one propellant.
Lack of Effect of the Length of Oligoglycine- and Oligo(ethylene glycol)-Derived para-Substituents on the Affinity of Benzenesulfonamides for Carbonic Anhydrase II in Solution
作者:Ahamindra Jain、Shaw G. Huang、George M. Whitesides
DOI:10.1021/ja00091a005
日期:1994.6
Using H-1 NMR spectroscopy, values of T-2 have been determined for the methylene protons of the oligoglycine moieties of para-substituted benzenesulfonamides having structures H2NO2SC6H4CO(Gly)(n)OH (n = 1-6) bound at the active site of bovine carbonic anhydrase II (CA, EC 4.2.1.1). These values have been correlated with measurements of dissociation constants of these complexes, in order to infer motion of these ligands when bound to the enzyme. Motion of glycines 1-3 (those closest to the aryl ring) is hindered by their proximity to the protein; motion of glycines 4-6 is relatively unhindered. Despite the restriction to motion inferred for glycines 1-3, the values of K-d for the six compounds (n = 1-6, 1-6) are indistinguishable within experimental uncertainty (+/-20%): K-d in mu M (n) 0.30 (1); 0.26 (2); 0.33 (3); 0.37 (4); 0.37 (5); 0.34 (6). There is, therefore, an unexpected compensation of the loss in conformational entropy on binding by another contributor to the free energy.