Lipophilic 1,3-xylyl-21-crown-6 macrocyclic polyether 2-carboxylic acids as biological mimics of the ionophore antibiotics
作者:Frank J. Urban、Larry R. Chappel、Arthur E. Girard、Banavara L. Mylari、Ian J. Pimblett
DOI:10.1021/jm00164a048
日期:1990.2
increasing the efficiency of feed utilization in cattle exhibited by the ionophore antibiotic monensin. The alkali ion salts of these lipophilic macrocyclic polyether carboxylic acids are very soluble in organic solvents and insoluble in water. These compounds are proposed to act as ion-transport agents and functional mimics of the ionophore antibiotics in the biological systems described above.
A series of tetrahydrofuran-containing, macrocyclic polyether compounds. The macrocycles have a 21-membered ring, incorporating six oxygen atoms, and they have a carboxy group (or a salt thereof) directed towards the interior of the ring. Administration of the compounds of the invention to ruminant animals (e.g. cattle and sheep) modifies their digestive fermentation processes such that the volatile fatty acids produced in the rumen contain a higher proportion of propionates rather than acetates, thereby increasing the efficiency of feed utilization in said ruminant animals. Additionally, the compounds of the invention show antibacterial activity in vitro against certain gram-positive microorganisms.
A series of novel, macrocyclic polyether compounds. The macrocycles have a 21-membered ring, containing six oxygen atoms, and they have a carboxy group (or a salt thereof) directed towards the interior of the ring. Administration of the compounds of the invention to ruminant animals (e.g. cattle and sheep) modifies their digestive fermentation processes such that the volatile fatty acids produced in the rumen contain a higher proportion of propionates rather than acetates, thereby increasing the efficiency of feed utilization in said ruminant animals. Additionally, the compounds of the invention show antibacterial activity in vitro against certain gram-positive microorganisms.
A New Cryptophane Receptor Featuring Three endo-Carboxylic Acid Groups: Synthesis, Host Behavior and Structural Study
作者:Christian E. O. Roesky、Edwin Weber、Torsten Rambusch、Holger Stephan、Karsten Gloe、Mátyás Czugler
DOI:10.1002/chem.200390127
日期:2003.3.3
Examples of a newtype of cryptophane molecule incorporating aromatic groups in the bridges (1-4) and, for the first time, being also supplied with three endo-positional ionizable carboxylic acid functions (1) have been synthesized and characterized. The cryptophane triester 2 yielded a solvate (channel inclusioncompound) with trichloromethane and water, the X-ray crystalstructure of which is reported
Novel water-soluble bowl-shaped cyclophanes 1 and 2 were synthesized. Complexation study in 25% aqueous methanol revealed that 1 and 2 form 2:1 (host/guest) complexes with 1-anilinonaphthalene-8-sulfonate (ANS). The emission wavelength of ANS encapsulated by 1 and 2 as well as the related monocyclic cyclophanes was usefully employed to demonstrate that the host/guest ratio of the complex significantly affects the micropolarity of the guest-binding site of these cyclophanes.