摘要:
Disclosed herein are methods of obtaining highly pure 5-azacytidine, which contains minimal amounts of degradation impurities and methods of assessing the impurity profile of the degradation of cytidine analogues, such as 5-azacytidine
摘要:
Provided is a process for purifying a letrozole product that contains an isoletrozole impurity, which process preferably includes converting at least a portion of the isoletrozole impurity into 4,4′-dicyanobenzophenone and removing 4,4′-dicyanobenzophenone, to produce a purified letrozole product.
摘要:
Provided is a process for purifying a letrozole product that contains an isoletrozole impurity, which process preferably includes converting at least a portion of the isoletrozole impurity into 4,4′-dicyanobenzophenone and removing 4,4′-dicyanobenzophenone, to produce a purified letrozole product.
摘要:
The present invention is directed to a process of preparing montelukast or a salt thereof with minimal amounts of impurities, such as a dehydration impurity (compound (VI)) or a cyclic ether impurity (compound (VIII)).
摘要:
The present invention provides a process for preparing 4-amino-1-isobutyl-1H-imidazo[4,5-c]quinoline (Imiquimod) of formula (I).The process comprises heating 4-chloro-1-isobutyl-1H-imidazo[4,5-c]quinoline of formula (II) with formamide, and optionally with bubbling of gaseous ammonia to afford Imiquimod of formula (I).According to the present invention, by using this process and novel purification methods, essentially as described herein, highly pure Imiquimod is obtained.
摘要:
A process for preparing pure levocetirizine and salts thereof, e.g., the levocetirizine dihydrochloride, and a pharmaceutical composition comprising levocetirizine dihydrochloride produced by the process are disclosed.
摘要:
The present invention provides a crystalline donepezil maleate, which is used as an intermediate in the preparation of donepezil hydrochloride. Also provided are novel processes for producing same in substantially pure form and a process for producing pharmaceutically pure amorphous donepezil hydrochloride therefrom.
摘要:
The present invention relates to an improved process of alkylating secondary amines, more particularly of alkylating compounds having amino piperidinic group, which are useful as donepezil intermediates, wherein an alcohol serves as reaction facilitator thus enabling to obtain donepezil and salts thereof in high quality and yield. The present invention also relates to the prevention of unwanted alkylation of donepezil precursors, having amino piperidinic group, by using suitable reaction conditions.
摘要:
A novel process is disclosed for producing Imatinib, using the precursor 2-chloro-4-(3-pyridyl)-pyrimidine, thus improving Imatinib preparation via an alternative synthetic route, avoiding the use of the toxic reagent cyanamide.
摘要:
A novel process is disclosed for producing Imatinib, using the precursor 2-chloro-4-(3-pyridyl)-pyrimidine, thus improving Imatinib preparation via an alternative synthetic route, avoiding the use of the toxic reagent cyanamide.