[EN] CYCLOALKYL DERIVATIVES OF 3-HYDROXY-4-PYRIDINONES<br/>[FR] DERIVES CYCLOALKYLE DE 3-HYDROXY-4-PYRIDINONES
申请人:APOTEX INC
公开号:WO2005049609A1
公开(公告)日:2005-06-02
The present invention provides an cycloalkyl derivative of 3-hydroxy-4-pyridinone which is useful for the chelation of metal ions such as iron. Its preparation and use is described. In particular, the invention concerns the removal of iron in chemical and biological systems including chelating agents having the formula (I); wherein R1 is X with the proviso that R2 is Y; or R1 is T with the proviso that R2 is W; or R1 is X with the proviso that R 2 R 5 N when taken together form a heterocyclic ring selected from piperidinyl, morpholinyl, pyrrolidinyl or piperazinyl, wherein the group piperidinyl, morpholinyl, pyrrolidinyl or piperazinyl is either unsubstituted or substituted with one to three C1 to C6 alkyl groups. X is C3-C6 cycloalkyl; Y is selected from the group consisting of C1 to C6 cycloalkyl; C1 to C6 alkyl, and C1 to C6 alkyl monosubstituted with a C3-C6 cycloalkyl; T is C1 to C6 alkyl; W is C3-C6 cycloalkyl; R3 is selected from the group consisting of hydrogen and C1 to C6 alkyl; R4 is selected from the group consisting of hydrogen and C1 to C6 alkyl; R5 is selected from the group consisting of hydrogen and C1 to C6 alkyl; and its pharmaceutically acceptable salt thereof. Pharmaceutical compositions of such compounds are useful in the removal of excess body iron from patients with iron overload diseases.
Process For The Manufacture Of 3-Hydroxy-N-Alkyl-1-Cycloalkyl-6-Alkyl-4-Oxo-1,4-Dihydropyridine-2-Carboxamide And Its Related Analogues
申请人:Tam Fat Tim
公开号:US20080096886A1
公开(公告)日:2008-04-24
The present invention relates to a novel process for the preparation of 1-alkyl or 1-cycloalkyl derivatives of 3-hydroxy-4-oxo-1,4-dihydropyridine-2-carboxamide of formula I.
The process includes reacting an amine R
2
NH
2
with a compound of formula II in a solution of metal hydroxide in water to give a compound of formula III. Subsequent reaction of the compound of formula III with an acid chloride formation reagent in an inert solvent gives compounds of formula I. The acid chloride formation reagent is selected from oxalyl chloride and dimethylformamide, dimethylchloromethylene-ammonium chloride and thionyl chloride and dimethylformamide. If desired, a compound of formula I where R
5
is hydrogen may be formed when an intermediate substituent is used wherein R
5
is an alcohol protective group removable by catalytic hydrogenation.
The present invention provides an cycloalkyl derivative of 3-hydroxy-4-pyridinone which is useful for the chelation of metal ions such as iron. Its preparation and use is described. In particular, the invention concerns the removal of iron in chemical and biological systems including chelating agents having the formula (I); wherein R1 is X with the proviso that R2 is Y; or R1 is T with the proviso that R2 is W; or R1 is X with the proviso that R2 R5 N when taken together form a heterocyclic ring selected from piperidinyl, morpholinyl, pyrrolidinyl or piperazinyl, wherein the group piperidinyl, morpholinyl, pyrrolidinyl or piperazinyl is either unsubstituted or substituted with one to three C1 to C6 alkyl groups. X is C3-C6 cycloalkyl; Y is selected from the group consisting of C1 to C6 cycloalkyl; C1 to C6 alkyl, and C1 to C6 alkyl monosubstituted with a C3-C6 cycloalkyl; T is C1 to C6 alkyl; W is C3-C6 cycloalkyl; R3 is selected from the group consisting of hydrogen and C1 to C6 alkyl; R4 is selected from the group consisting of hydrogen and C1 to C6 alkyl; R5 is selected from the group consisting of hydrogen and C1 to C6 alkyl; and its pharmaceutically acceptable salt thereof. Pharmaceutical compositions of such compounds are useful in the removal of excess body iron from patients with iron overload diseases.
Process for the manufacture of 3-hydroxy-N-alkyl-1-cycloalky1-6-alkyl-4-oxo-1,4-dihydropyridine-2-carboxamide and its related analogues
申请人:Apotex Inc
公开号:US07893269B2
公开(公告)日:2011-02-22
The present invention relates to a novel process for the preparation of 1-alkyl or 1-cycloalkyl derivatives of 3-hydroxy-4-oxo-1,4-dihydropyridine-2-carboxamide of formula (I). The process includes reacting an amine R2NH2 with a compound of formula (II) in a solution of metal hydroxide in water to give a compound of formula (III). Subsequent reaction of the compound of formula (III) with an acid chloride formation reagent in an inert solvent gives compounds of formula (I). The acid chloride formation reagent is selected from oxalyl chloride and dimethylformamide, dimethylchloromethylene-ammonium chloride and thionyl chloride and dimethylformamide. If desired, a compound of formula (I) where R5 is hydrogen may be formed when an intermediate substituent is used wherein R5 is an alcohol protective group removable by catalytic hydrogenation.