摘要:
A process is described for preparing an intermediate in the synthesis of naproxen.The intermediate, namely the methyl ester of S(+)-2-(5-bromo-6-methoxy-2-naphthyl)-propionic acid or of its 5-chloro analogue, is prepared by preferential crystallization from mixtures with its enantiomer.
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:
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:
A crystallization process of crude 5-(2',4'-difluorophenyl)-salicylic acid from a mixture of an aromatic hydrocarbon and an aliphatic ketone for preparing 5-(2',4'-difluorophenyl)-salicylic acid in form II substantially pure is described.
摘要:
A process is described for the preparation of 2-methoxy-6-propionyl-naphthalene, an intermediate in the synthesis of naproxen.The process consists of Friedel-Crafts acylation of 2-methoxy-naphthalene, and obviates the drawbacks related to the use of nitrobenzene as solvent.
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 preparation of heteroaryl-phenylalanines of formula (II) in which R is a hydrogen atom, a straight or branched C1-C4 alkyl groups or a benzyl group; R1 is an optionally substituted 5 or 6 membered aromatic heterocyclic group with one or two heteroatoms selected among nitrogen, oxygen and sulphur; comprising a cross-coupling reaction among heteroaryl-zinc halide and phenylalanine derivatives is described. Compounds of formula (II) are intermediates useful for the preparation of compounds endowed with pharmacological activity.