摘要:
A process for the preparation of (S)-N,N'-bis�2-hydroxy-1-(hydroxymethyl)ethyl!-5-(2-acetoxy-propionylamino)-2,4,6-triiodo-isophthalamide, an intermediate useful for the synthesis of iopamidol, by reaction between L-5-(2-acetoxy-propionylamino)-2,4,6-triiiodoisophthaloyl dichloride and 2-amino-1 ,3-propanediol in N-methylpyrrolidone and in the presence of a base, is described.
摘要:
A process for purifying Iopamidol which uses a butanol as solvent is described. Iopamidol is obtained with high yields, also starting from aqueous solutions of the same and has characteristics in accordance with those required by pharmacopoeia.
摘要:
A process for the purification of 2,6-diisopropylphenol (Propofol) by transformation of the crude Propofol into its ester with a carboxylic or sulphonic acid, crystallization and hydrolysis, is described.
摘要:
Process for the preparation of (2S,3S)-2,3-dihydro-3-hydroxy-2-(4-methoxyphenyl)-1,5-benzothiazepin-4(5H)-one of formula ##STR1## by direct cyclization of the compound of the formula ##STR2## with a catalytic amount of phosphonic acid.
摘要:
The present invention provides a processes for preparing 5-Azacytidine, and intermediates thereof. The present invention further provides an analytical method for determining the purity of 5-Azacytidine in a sample.
摘要:
A process for the direct and regioselective functionalization of phenothiazine which allows one to introduce an SH group in position 2, said process comprising the sulfination or sulfonation of the phenothiazine N-protected with an alkoxycarbonyl, an alkylsulfonyl or an arylsulfonyl group, the reduction of the produce obtained to give the N-protected 2-mercapto-phenothiazine, and the deprotection of the nitrogen atom. The thus-obtained 2-mercapto-phenothiazine is an important intermediate for the preparation of pharmacological active compounds.
摘要:
A process for the preparation of 4-(2,4-difluorophenyl)-phenyl 4-nitro-benzoate, an intermediate for the preparation of 5-(2,4-difluorophenyl)-salicylic acid, which is a drug known with the international non-proprietary name Diflunisal, is described.
摘要:
A process for the preparation of 4-(2,4-difluorophenyl)-phenyl 4-nitro-benzoate, an intermediate for the preparation of 5-(2,4-difluorophenyl)-salicylic acid, which is a drug known with the international non-proprietary name Diflunisal, is described.
摘要:
A process for the preparation of the compound (2S,3S)(+)-3-hydroxy-2,3-dihydro-2-(4-methoxyphenyl)-5-(2-dimethylaminoethyl)-1, 5-benzothiazepin-4(5H)-one is described. Said compound is an intermediate useful in the synthesis of Diltiazem.
摘要:
The present invention provides a processes for preparing 5-Azacytidine, and intermediates thereof. The present invention further provides an analytical method for determining the purity of 5-Azacytidine in a sample.