摘要:
The present invention relates to a process for the preparation of compounds of general formula (I), wherein R stands for a straight chained C.sub.1-5 alkyl group substituted by a chlorine atom in the 2-position, and acid addition salts thereof, characterized by reacting a 3,5-dichloro-2-alkanone of general formula (V), wherein R is a defined above, with an inorganic thiocyamate, and a) converting the 3-thiocyanato-5-chloro-2-alkanone of general formula (IV), thus obtained, wherein R is as defined above, into 2-chloro-4-methyl-5-(2-chloroalkyl)-thiazole of general formula (II), wherein R is as defined above, by gaseous hydrochloric acid in an organic solvent, hydrogenating the said compound in the presence of a metal catalyst in an organic solvent, or b) reacting said compound of general formula (IV) with an aqueous mineral acid and treating the 2-hydroxy-4-methyl-5-(2-chloroalkyl)-thiazole of general formula (III), thus obtained with a halogenating agent, and hydrogenating the 2-chloro-4-methyl-5-(2-chloroalkyl)-thiazole of general formula (II) thus obtained, wherein R is as defined above, in an organic solvent in presence of a metal catalyst, and optionally converting the 4-methyl-5-(2-chloroalkyl)-thiazole of general formula (I), wherein R is as defined above, thus obtained or a hydrochloride salt thereof, in a manner known per into another acid addition salt or setting free a compound of general formula (I), wherein R is a defined above, from its acid addition salt.
摘要:
A process is described for the preparation of 4-Methyl-5-(2-Chloroalkyl)-thiazole wherein the alkyl ranges from C.sub.2 -C.sub.5, by providing the steps of either a) converting the 3-thiocyanato-5-chloro-2-alkanone into 2-chloro-4-methyl-5-(2-chloroalkyl)-thiazole by gaseous hydrochloric acid in an organic solvent and hydrogenating the compound in the presence of a metal catalyst in an organic solvent, or b) reacting 3-thiocyanato-5-choro-2-alkanone with aqueous mineral acid and treating the thiazole obtained with a halogenating agent, and hydrogenating the 2-chloro-4-methyl-5-(2-chloroalkyl)-thiazole in an organic solvent in presence of a metal catalyst.
摘要:
The present invention is directed to the preparation of benzimidazole derivatives of the formula (I), ##STR1## wherein A=stands for S, SO or SO.sub.2,R.sup.1 =stands for C.sub.1-4 alkyl group,R.sup.2 =stands for C.sub.1-4 alkyl, C.sub.3-7 cycloalkyl or C.sub.6-10 aryl or aralkyl,comprising reacting a sulphochloride of the formula (II) ##STR2## with an alkyl aluminum compound of the formula (III).R.sub.n.sup.2 AlClhd (3-n) (III)The reaction is performed in one step.
摘要:
The present invention relates to a process for the preparation of a compound of general formula (I), ##STR1## wherein R.sup.1 represents a hydrogen atom or an alkyl group of 1-6 carbon atoms, and their salts, wherein the compound of formula (II): ##STR2## is reacted with a compound of formula (III): ##STR3## wherein R represents an alkyl group of 1-4 carbon atoms and R.sup.1 is the same as defined above, by heating their neutral pH mixtures at the boiling temperature of the mixture, and the resulting compound of general formula (IV): ##STR4## wherein R and R.sup.1 are the same as defined above, is cyclized into the compound of general formula (I) by further elevating the temperature of the neutral mixture, and if desired, the compounds of general formula (I) are transformed into their salts, or the compounds of general formula (I) are liberated from their salts.
摘要:
A process is disclosed for the preparation of a compound of the Formula (VI) ##STR1## wherein X is a hydrogen atom, or OH,Y is a hydrogen atom, OH or a methyl group,R.sup.2 is a CH--COOR group, or a group of the formula (XI) ##STR2## and R is a C.sub.1 to C.sub.2 alkyl group, which comprises the step of: reacting a condensed salt of the Formula (IV) ##STR3## wherein Me is Na.sup.+ or K.sup.+, with a reactive derivative of trifluoromethane-sulfonic acid of the Formula (V)F.sub.3 C--SO.sub.2 OH.The compounds of the Formula (VI) are intermediates in the preparation of penicillins and cephalosporins with antibiotic activity.
摘要:
The invention relates to a novel process for preparation of drohedarone of formula (I) and pharmaceutically acceptable salts thereof characterized in that a compound of formula (II) is reacted in the presence of a reductive agent with butyraldehyde and/or butanoic acid, and isolating the obtained product and, if desired, converting it into a pharmaceutically acceptable salt thereof. The invention also relates to some hovel intermediary compounds and the preparation thereof.
摘要:
The invention relates to a novel process for preparation of N-[2-n-butyl-3-[4-[3-(di-n-butylamino)-propoxy]-benzoyl]-benzofuran-5-yl]methanesulfonamide (I) and pharmaceutical acceptable salts thereof, where a salt of (5-amino-2-butyl-1-benzofuran-3-yl){4-[3-(di-n-butylamino)propoxy]phenyl}methanone of formula (II)—where A is a mono- or dibasic acid forming an acid addition salt with the compound of formula (II), n is 1 if A is dibasic acid and n is 1 or 2 if A is a monobasic acid—is reacted with a mesylating reagent in a heterogen reaction, if desired, in the presence of a phase transfer catalyst. The invention also relates to the novel salts of compound of formula (II), for the preparation thereof and their use in the preparation of dronedarone.
摘要:
The invention relates to a novel process for preparation of drohedarone of formula (I) and pharmaceutically acceptable salts thereof characterized in that a compound of formula (II) is reacted in the presence of a reductive agent with butyraldehyde and/or butanoic acid, and isolating the obtained product and, if desired, converting it into a pharmaceutically acceptable salt thereof. The invention also relates to some hovel intermediary compounds and the preparation thereof.
摘要:
The invention relates to a novel process for preparation of N-[2-n-butyl-3-[4-[3-(di-n-butylamino)-propoxy]-benzoyl]-benzofuran-5-yl]methanesulfonamide (I) and pharmaceutical acceptable salts thereof, where a salt of (5-amino-2-butyl-1-benzofuran-3-yl) {4-[3-(di-n-butylamino)propoxy]phenyl}methanone of formula (II)—where A is a mono- or dibasic acid forming an acid addition salt with the compound of formula (II), n is 1 if A is dibasic acid and n is 1 or 2 if A is a monobasic acid—is reacted with a mesylating reagent in a heterogen reaction, if desired, in the presence of a phase transfer catalyst. The invention also relates to the novel salts of compound of formula (II), for the preparation thereof and their use in the preparation of dronedarone.