Sulfur-Rich Zinc Chemistry: New Tris(thioimidazolyl)hydroborate Ligands and Their Zinc Complex Chemistry Related to the Structure and Function of Alcohol Dehydrogenase
作者:Markus Tesmer、Mouhai Shu、Heinrich Vahrenkamp
DOI:10.1021/ic0101275
日期:2001.7.1
yielded the tetrahedral complexes Tt(R)Zn-X with X = F, Cl, ONO(2) and (Tt(t)()(-)(Bu))(2)Zn. With zinc perchlorate the labile perchlorate complexes Tt(R)Zn-OClO(3) were obtained. They served as starting materials for the incorporation of substrates which are relevant for the chemistry of horse liver alcohol dehydrogenase: Ethanol led to [Tt(t)()(-Bu)Zn.EtOH] ClO(4).EtOH, p-nitrophenol (NitOH) yielded
LINCOSAMIDE DERIVATIVES AND ANTIMICROBIAL AGENTS COMPRISING THE SAME AS ACTIVE INGREDIENT
申请人:Umemura Eijirou
公开号:US20100184746A1
公开(公告)日:2010-07-22
An objective of the present invention is to provide compounds of formula (I) or their pharmacologically acceptable salts or solvates wherein A represents aryl while R
1
represents a five- or six-membered monocyclic heterocyclic group, or A represents a four- to six-membered monocyclic heterocyclic group while R
1
represents aryl or a five- or six-membered monocyclic heterocyclic group; R
2
represents a hydrogen atom or C
1-6
alkyl; R
3
represents C
1-6
alkyl or C
3-6
cycloalkyl-C
1-4
alkyl; R
4
, R
5
, and R
6
represent a hydrogen atom; R
7
represents C
1-6
alkyl; and m is 1 to 3. The compounds are novel lincosamide derivatives that have a potent activity against resistant
Streptococcus pneumoniae
. Further, the compounds are usable as antimicrobial agents and are useful for preventing or treating bacterial infectious diseases.
tripodal NS2 ligands of the bis(mercaptoimidazolyl)(pyrazolyl)borate type with varying 3-R-mercaptoimidazolyl moieties were prepared as their potassium salts. Treatment with zinc salts yielded the complex types L·Zn−Cl, L·Zn−I, L·Zn−ONO2, L·Zn−OClO3 and [L·Zn(imidazole)]ClO4. Attempts at the formation of L·Zn−OH or cationic L·Zn complexes resulted in dismutation and formation of ZnL2 complexes. Hydrolytic