A novel enantioselective preparation of α-fluoro-β-keto acids
摘要:
A two-step method for the enantioselective preparation of alpha-fluorinated beta-keto acids from 1,3-dioxin-4-ones having l-menthone as the chiral auxiliary at the 2-position is described. The method consists of fluorination of the dioxinones by molecular fluorine and solvolytic cleavage of the acetal function.
The present invention relates to compounds of formula I
wherein R
1
to R
4
and G are as defined in the description and claims and pharmaceutically acceptable salts thereof. The compounds are useful for the treatment and/or prevention of diseases which are associated with the modulation of H3 receptors.
The present invention relates to compounds of formula I
wherein A and R
1
to R
4
are as defined in the description and claims, and pharmaceutically acceptable salts thereof. The compounds are useful for the treatment and/or prevention of diseases which are associated with the modulation of H3 receptors.
Compounds of the general formula
A - B
where A is a carboxylic acid group having a carbon chain of 3-10 carbon atoms and preferably being branched, and which includes one or more oxo groups, and B is hydrogen, a pharmaceutically acceptable metal atom, an alcohol bound as ester and having 1-5 carbon atoms and 1-3 hydroxy groups, or a glycerol group bound as ester, can be used as a nutrient substrate, an antimicrobial and antiviral agent, and/or as an agent for influencing the central nervous system.
The invention also relates to compositions intended for the aforementioned usages and containing at least one compound A - B.
一般公式为 A - B 的化合物
其中 A 是一个具有 3-10 个碳原子的碳链的羧酸基团,最好是分支的,并且包括一个或多个氧代基团,B 是氢,一种药物上可接受的金属原子,一个作为酯键合的醇,有 1-5 个碳原子和 1-3 个羟基,或一个作为酯键合的甘油基团,可以用作营养底物,抗菌和抗病毒剂,以及/或作为影响中枢神经系统的剂。
该发明还涉及旨在上述用途并含有至少一个化合物 A - B 的组合物。
Indole derivatives as mcp-1 receptor antagonists
申请人:——
公开号:US20030144339A1
公开(公告)日:2003-07-31
A compound of formula (I) wherein: R
1
is hydrogen, halo or methoxy; R
2
is hydrogen, halo, methyl, ethyl or methoxy; R
3
is a halo group or a trifluoromethyl group; R
4
is a halo group or a trifluoromethyl group; R
5
is hydrogen or halo; R
6
is hydrogen or halo; provided that when R
5
and R
6
are both hydrogen, and one of R
3
or R
4
is chloro or fluoro, then the other is not chloro or fluoro; or a pharmaceutically acceptable salt or prodrug thereof. These compounds have useful activity for the treatment of inflammatory disease, specifically in antagonising an MCP-1 mediated effect in a warm-blooded animal such as a human being.
The invention provides compounds and compositions of Formulas I-VII, and methods of using the compounds. The compounds can be used to prepare dye conjugates that are uniformly and substantially more fluorescent on proteins, nucleic acids or other biopolymers, than conjugates labeled with structurally similar known carbocyanine dyes. In addition to having more intense fluorescence emission than structurally similar dyes at virtually identical wavelengths, and decreased artifacts in their absorption spectra upon conjugation to biopolymers, the compounds can have greater photostability and/or higher absorbance (extinction coefficients) at the wavelength(s) of peak absorbance than such structurally similar dyes.