Benzamidine derivatives and their use as anti-coagulants
申请人:Berlex Laboratories, Inc.
公开号:US06350746B1
公开(公告)日:2002-02-26
This invention is directed to benzamidine derivatives which are useful as anti-coagulants. This invention is also directed to pharmaceutical compositions containing the compounds of the invention, and methods of using the compounds to treat disease-states characterized by thrombotic activity.
Method of preparing alkyl halopyridinyloxyalkanoates
申请人:The Dow Chemical Company
公开号:US04127582A1
公开(公告)日:1978-11-28
A novel method for the preparation of alkyl halopyridinyloxyalkanoate compounds is disclosed, which comprises reacting a halopyridine with an alkyl alpha-hydroxy alkanoate in the presence of an alkali metal carbonate promoter. The ester products prepared from this method are useful as herbicides.
Antibacterial 3,5-diaminopiperidine-substituted aromatic and heteroaromatic compouds
申请人:Zhou Yuefen
公开号:US20050239827A1
公开(公告)日:2005-10-27
The invention relates to antibacterial 3,5-diaminopiperidine-substituted aromatic and heteroaromatic compounds and pharmaceutical compositions thereof. This invention also relates to a method of using such compounds in the treatment of bacterial infections in mammals, especially humans.
A process for preparing a fluoropyridine compound by reacting a chlorinated pyridine compound with a molar excess of an alkali metal fluoride, especially potassium fluoride, in the presence of a catalytic amount of a catalyst selected from halides of organometals and halides of metals of the iron, nickel and copper groups, and which is preferably FeCl3, whereby at least one chlorine atom of the chlorinated pyridine compound is replaced by a fluorine atom. Of special interest is the preparation of 3,5-dichloro-2,4,6-trichloropyridine from pentachloropyridine.
The compounds prepared by such a process are useful for the preparation of agriculturally-useful fluoropyridines.
Alpha, beta- and beta, gamma-difluoropyridine compounds are prepared by contacting a beta-halo- alpha- or gamma-fluoropyridine compound or suitable precursor thereof with an effective amount of KF or CsF in a polar aprotic solvent (diluent) at an elevated temperature under substantially anhydrous conditions with removal of the difluoropyridine products essentially as they are formed. The starting material may optionally be added as the reaction proceeds to minimize decomposition. The reaction is also optionally conducted in the presence of an acid scavenger and/or a crown ether or other phase-transfer catalyst.