Synthesis and biological evaluation of orally active matrix metalloproteinase inhibitors
摘要:
The synthesis and biological evaluation of orally active inhibitors of matrix metalloproteinase are reported. Modifications of the P2' position and the a-substituent of hydroxamic acid derivatives were carried out, and revealed that the P2' substituent influenced the MMP inhibitory activities in vitro and in plasma after oral administration. The hydroxamates with phenylglycine at the P2' position were absorbed well orally. Compound 15e, which exhibited the longest duration of inhibitory activity in plasma after oral administration among the phenylglycine derivatives (5a-5d, 15a, 15c, 15e), was evaluated in a rat adjuvant arthritis model. A reduction in hind foot pad swelling and improvements of some inflammatory parameters were demonstrated when the compound was administered orally. These results indicate the potential of MMP inhibitors for rheumatoid arthritis. (C) 1997 Elsevier Science Ltd.
by a rational approach. With this D-aminoacid oxidase variant the complete resolution of all the unnatural amino acids tested was obtained: in this case, the bioconversion requires a shorter time and a lower amount of biocatalyst compared to the wild-type enzyme. The simultaneous production of the corresponding α-keto acid, a possible precursor of the amino acid in the L-form, improves the significance
Effects of Extended Aryl-Substituted Bisoxazoline Ligands in Asymmetric Synthesis - Efficient Synthesis and Application of 4,4′-Bis(1-Naphthyl)-, 4,4′-Bis(2-Naphthyl)- and 4,4′-Bis(9-Anthryl)-2,2′-isopropylidenebis(1,3-oxazolines)
作者:Hester L. van Lingen、Floris L. van Delft、Roy P. M. Storcken、Koen F. W. Hekking、Anouk Klaassen、Jan J. M. Smits、Patrycja Ruskowska、Jadwiga Frelek、Floris P. J. T. Rutjes
DOI:10.1002/ejoc.200500566
日期:2005.12
The steric influence of extended aryl substituents on 2,2′-bis(1,3-oxazoline) ligands was investigated in a series of asymmetric catalytic reactions such as Mukaiyama aldol and Michael reactions, hetero-Diels–Alder processes, and allylic alkylation reactions. 4,4′-(2-Naphthyl)- and 4,4′-(9-anthryl)-substituted isopropylidene-bridged 2,2′-bis(1,3-oxazolines) were synthesized and their enantioselective
Highly Enantioselective Oxidative Couplings of 2-Naphthols Catalyzed by Chiral Bimetallic Oxovanadium Complexes with Either Oxygen or Air as Oxidant
作者:Qi-Xiang Guo、Zhi-Jun Wu、Zhi-Bin Luo、Quan-Zhong Liu、Jian-Liang Ye、Shi-Wei Luo、Lin-Feng Cun、Liu-Zhu Gong
DOI:10.1021/ja074322f
日期:2007.11.1
L-isoleucine and H8-binaphthol is highlyefficient at catalyzing the air-oxidized coupling of 2-naphthols with excellent enantioselectivities of up to 97% ee. 51V NMR study shows that the oxovanadium complexes have two vanadium(V) species. Kinetic studies, the cross-coupling reaction, and HRMS spectral studies on the reaction have been carried out and illustrate that two vanadium(V) species are both involved
Disclosed are compounds having at least one quaternary alkyl ammonium functionality. The compounds inhibit bacterial efflux pump inhibitors and are used in combination with an anti-bacterial agent to treat or prevent bacterial infections. These combinations can be effective against bacterial infections that have developed resistance to anti-bacterial agents through an efflux pump mechanism.