摘要:
A method for the preparation of 2-(4-methoxycarbonylpyrazol-1-yl)adenosine of formula 1a and 2-(4-ethoxycarbonylpyrazol-1-yl)adenosine of formula 1b by reaction of 2-hydrazinoadenosine of formula III and the sodium salt of 3,3-dimethoxy-2-methoxycarbonylpropen-1-ol of formula Va or the sodium salt of 3,3-diethoxy-2-ethoxycarbonylpropen-1-ol of formula Vb in combination with a solvent and an acidic agent.
摘要:
A method for preparing 4-[3,5-bis(2-hydroxyphenyl)-[1,2,4]triazol-1-yl]benzoic acid of formula (I) by reaction of 2-(2-hydroxyphenyl)benz[e][1,3]oxazin-4-one of formula (II) with 4-hydrazinobenzoic acid of formula (III) in an organic acid or in a mixture of an organic acid and an organic solvent.
摘要:
A method for preparing 4-[3,5-bis(2-hydroxyphenyl )-[1,2,4]triazol-1-yl]benzoic acid of formula (I) by reaction of 2-(2-hydroxyphenyl)benz[e][1,3]oxazin-4-one of formula (II) with 4-hydrazinobenzoic acid of formula (III) in an organic acid or in a mixture of an organic acid and an organic solvent.
摘要:
A method for the preparation of salts of 2-[2-(4-dibenzo[b,fj[1,4]thiazepin-11-yl-1 -piperazinyl)ethoxy]ethanol (quetiapine) from the quetiapine base and the respective acid, wherein the salt is precipitated from a mixture of solvents, the mixture being either a mixture of an aromatic hydrocarbon and a ketone or ester, or that of an aromatic hydrocarbon, water and a ketone or ester. The salts of quetiapine are purified by partial crystallization, wherein only a part of the salt of quetiapine is dissolved in a C1 to C6 alcohol used.
摘要:
A process for preparing optically pure enantiomers of R-(−)tamsulosin of formiula Ia and S-(+)tamsulosin of formula Ib by resolving racemic tamsulosin of formula I by means of (IR)-(−)-camphor-10-sulfonic acid and (1S)-(+)-camphor-10-sulfonic acid, resp., in an environment of organic solvents, water or mixtures thereof.
摘要:
A process for preparing optically pure enantiomers of R-(−)tamsulosin of formula Ia and S-(+)tamsulosin of formula Ib by resolving racemic tamsulosin of formula I by means of (1R)-(−)-camphor-10-sulfonic acid and (1S)-(+)-camphor-10-sulfonic acid, resp., in an environment of organic solvents, water or mixtures thereof.
摘要:
The invention deals with a preparation method of salts of 5-chloro-4-(2-imidazolin-2-yl-amino)-2,1,3-benzothiadiazole (tizanidine) of formula I, especially tizanidine hydrochloride, comprising preparation of a salt of tizanidine of formula I and a carboxylic acid as an intermediate, from which, after acidification with hydrogen chloride, tizanidine hydrochloride is obtained in a high yield and purity.
摘要:
The invention deals with a preparation method of salts of 5-chloro-4-(2-imidazolin-2-yl-amino)-2,1,3-benzothiadiazole (tizanidine) of formula I, especially tizanidine hydrochloride, comprising preparation of a salt of tizanidine of formula I and a carboxylic acid as an intermediate, from which, after acidification with hydrogen chloride, tizanidine hydrochloride is obtained in a high yield and purity.
摘要:
A method for the preparation of salts of 2-[2-(4-dibenzo[b,fj[1,4]thiazepin-11-yl-1-piperazinyl)ethoxy]ethanol (quetiapine) from the quetiapine base and the respective acid, wherein the salt is precipitated from a mixture of solvents, the mixture being either a mixture of an aromatic hydrocarbon and a ketone or ester, or that of an aromatic hydrocarbon, water and a ketone or ester. The salts of quetiapine are purified by partial crystallization, wherein only a part of the salt of quetiapine is dissolved in a C1 to C6 alcohol used.