The process starts by reacting 2,3,5 trimethylpyridine with hydrogen peroxide in the presence of catalysts, giving new reactive ionic species allowing the number of required steps to be substantially reduced. In the final important step, oxidation to omeprazol, there are used new salts of 5-methoxy-2-((3,5-dimethyl-4-methoxy-2-pyridine)methylthio)-1H-benzimidazole which, as the oxidation evolves, precipitate the omeprazol. The new oxidation method avoids superoxidations, provide for faster oxidation, high purity and yields of over 90%.
Cyclic 1-(acyloxy)-alkyl prodrugs of GABA analogs, compositions and uses thereof
申请人:——
公开号:US20030236200A1
公开(公告)日:2003-12-25
The present invention provides cyclic 1-(acyloxy)-alkyl prodrugs of GABA analogs, methods of making cyclic 1-(acyloxy)-alkyl prodrugs of GABA analogs and compositions of cyclic 1-(acyloxy)-alkyl prodrugs of GABA analogs. The present invention also provides methods of using cyclic 1-(acyloxy)-alkyl prodrugs of GABA analogs and compositions of cyclic 1-(acyloxy)-alkyl prodrugs of GABA analogs.
Methods for synthesis of prodrugs from 1-acyl-alkyl derivatives and compositions thereof
申请人:——
公开号:US20030171303A1
公开(公告)日:2003-09-11
The present invention provides a method for synthesizing 1-(acyloxy)-alkyl derivatives from 1-acyl-alkyl derivatives, which typically proceeds stereospecifically, in high yield, does not require the use of activated intermediates and/or toxic compounds and is readily amenable to scale-up. The current invention also provides 1-acyl-alkyl derivatives of known drug compounds and methods for synthesizing these 1-acyl-alkyl derivatives.
Synthesis of acyloxyalkyl carbamate prodrugs and intermediates thereof
申请人:Gallop A. Mark
公开号:US20050222431A1
公开(公告)日:2005-10-06
Methods for synthesis of
1
-(acyloxy)-alkyl carbamates, particularly, the synthesis of
1
-(acyloxy)-alkyl carbamate prodrugs of primary or secondary amine-containing drugs are described. Also described are methods for synthesis of
1
-(acyloxy)-alkyl N-hydroxysuccinimidyl carbonates which are useful intermediates in the synthesis of
1
-(acyloxy)-alkyl carbamates are also described.
Disclosed herein are methods for synthesizing 1-(acyloxy)-alkyl prodrug derivatives of drugs through oxidation of 1-acyl-alkyl derivatives of drugs under anhydrous reaction conditions. The methods typically proceed stereospecifically, in high yield, do not require the use of activated intermediates and/or toxic compounds and are readily amenable to scale-up.