摘要:
A process for preparing fexofenadine is described, which provides for the hydrolysis of 4-[4-[4-(hydroxydiphenylmethyl)-1-piperidyl]-1-oxobutyl]-α,α-dimethylbenzeneacetic acid-alkyl ester, in a mixture of water and optionally an organic solvent, in the presence of a base; the carboxylate salt of 4-[4-[4-(hydroxydiphenylmethyl)-1-piperidyl]-1-oxobutyl]-α,α-dimethylbenzeneacetic acid is thus obtained, which is then directly reduced as carboxylate in a basic environment with hydrogen in the presence of a suitable hydrogenation catalyst to give the carboxylate of fexofenadine, which is precipitated by neutralisation of the solution.
摘要:
The compounds of formula ##STR1## wherein R, R.sub.1, R.sub.2, R.sub.3, and R.sub.4 have the meanings given in the specification, are described.The compounds of formula I are active as inhibitors of the enzyme HMG-CoA reductase and can be used in therapy as anti-hypercholesterolemics.
摘要:
The present invention provides medicinal compounds that are characterized by a cyclic moiety (A) linked through a carboxamido group (more specifically, a carbamate group or a urea group) to another cyclic moiety (B) which is in turn linked to another, N-substituted carboxamido group. These compounds can be used an anti-inflammatory and immunosuppressive agents, as demonstrated by their inhibition of the production of IL-1.beta. in vitro and TNF.alpha. in vivo.
摘要:
Compounds of formula I ##STR1## wherein R represents hydrogen, C.sub.1 -C.sub.6 alkyl, C.sub.5 -C.sub.7 cycloalkyl, methylene-dioxy or phenyl, which may be substituted by one or two groups independently selected from hydroxy, halogen, nitro, C.sub.1 -C.sub.6 alkyl or C.sub.1 -C.sub.6 alkoxy; R.sub.1 and R.sub.2 independently represent hydrogen, COOR.sub.3, --CONR.sub.4 R.sub.5, ##STR2## --OCONR.sub.4 R.sub.5, --OCOR.sub.3, --NR.sub.4 R.sub.5, --OCOOR.sub.6, --NR.sub.3 COR.sub.7, --NR.sub.CONR.sub.4 R.sub.5, --N.dbd.CH--NR.sub.4 R.sub.5, NO.sub.2, CN, OH, SR.sub.3, wherein R.sub.3 is hydrogen or C.sub.1 -C.sub.6 alkyl, R.sub.4 and R.sub.5 independently are hydrogen or C.sub.1 -C.sub.6 alkyl, R.sub.6 is C.sub.1 -C.sub.6 alkyl, and R.sub.7 is hydrogen, C.sub.1 -C.sub.6 alkyl or C.sub.1 -C.sub.6 alkoxy, with the proviso that R.sub.1 and R.sub.2 cannot be hydrogen at the same time; X is oxygen or sulphur; Y represents a C.sub.2 -C.sub.6 alkylene chain or a C.sub.5 -C.sub.7 cycloalkylene group; and their pharmaceutically acceptable salts are provided and their use in pharmaceutical compositions which may be used in the treatment of cardiovascular diseases.
摘要:
Cardioactive steroidal compounds of the formula I ##STR1## wherein R, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 and R.sub.7 have the meanings shown in the description, and pharmaceutical compositions containing them.
摘要:
The present invention relates to an enantioselective enzymatic process for the preparation of an optically active 3-hydroxypiperidinecarboxylic acid derivative.
摘要:
The present invention relates to a process for the preparation of controlled-release solid oral pharmaceutical formulations of oxcarbazepine, and the pharmaceutical formulations obtainable by said process.
摘要:
A process is disclosed for the stereo-selective preparation of emtricitabine, which allows the desired product to be obtained in good yield and without the use of chromatographic techniques. The process for the production of emtricitabine of the formula (Ia) is characterized by the formation and isolation of intermediate compounds of formula (XIa) in salified form. Emtricitabine is a known antiviral drug.
摘要:
The present invention relates to a process for preparing 2,5-disubstituted 3-alkyl-thiophenes and more particularly to a process for preparing them that comprises an acylation reaction in position 5 of 2-substituted 3-alkylthiophenes. This process does not need reagents which are difficult to handle and does not need anhydrous conditions or inert atmosphere. The resulting product is obtained in high purity.
摘要:
The present invention relates to a process for preparing 5′-acetylstavudine, an intermediate which is useful in the preparation of 2′,3′-didehydro-3′-deoxythymidine, an active principle with antiviral action which is commonly known as stavudine (D4T).