摘要:
The present invention refers to a process for the preparation of 5-amino-2,4,6-triiodo-1,3-benzenedicarboxylic acid dichloride, comprising the reaction in heterogeneous phase between 5-amino-2,4,6-triiodo-1,3-benzenedicarboxylic acid and thionyl chloride, in a solvent selected from the group consisting of: (C.sub.7 -C.sub.16) linear or branched hydrocarbons, (C.sub.7 -C.sub.8) aromatic hydrocarbons, 1,1,1-trichloroethane, n-butylacetate, diglyme (diethylenglycoledimethylether), and in the presence of a catalytic amount of a tertiary amine.
摘要:
17-Aryl -5.alpha.,14.beta.-androstane, androstene and androstadiene derivatives of formula (I): ##STR1## wherein the symbol --- represents a single or a double bond; when the double bond is not present in the 4 or 5 position, the hydrogen in position 5 has the .alpha. configuration; Y is oxygen or guanidinoimino, when --- in position 3 is a double bond; Y is hydroxy, OR.sup.2 or SR.sup.2, when in position 3 is a single bond and has an .alpha. or .beta. configuration; R is a substituted or unsubstituted aryl ring; and R.sup.1 is hydrogen, methyl, ethyl or n-propyl substituted by OH or NR.sup.4 R.sup.5.
摘要:
This invention refers to a process for the crystallization from water of S-N,N'-bis�2-hydroxy-1(hydroxymethyl)ethyl!-5-�(2-hydroxy-1-oxopropyl)amino!-2,4,6-triiodo-1,3-benzendicarboxamide known as Iopamidol. According to the process of this invention, a crystalline anhydrous Iopamidol in accordance with pharmacopeia standards can be obtained.
摘要:
The present invention refers to a process for the preparation of 5-amino-2,4,6-triiodo-1,3-benzenedicarboxylic acid, comprising the following steps: a) catalytic hydrogenation of 5-nitro-1,3-benzenedicarboxylic acid in neutral or basic environment, which gives an aqueous solution of 5-amino-1,3-benzenedicarboxylic acid sodium salt; b) direct iodination of the 5-amino-1,3-benzenedicarboxylic acid sodium salt solution deriving from step a), without further purification, with a solution of ICl in HCl, being the 5-amino-1,3-benzenedicarboxylic acid sodium salt solution previously added with HCl and H.sub.2 SO.sub.4.
摘要:
The present invention refers to a Process for the preparation of S-(-)-5-��2-(acetyloxy)-1-oxopropyl!amino!-2,4,6-triiodo-1,3-benzenedicarboxylic acid dichloride of formula (I) comprising the reaction between S-(-)-�2-(acetyloxy)!propionic acid chloride and 5-amino-2,4,6-triiodo-, 1,3-benzenedicarboxylic acid dichloride, in an aprotic dipolar solvent and in presence of a halogenhydric acid.
摘要:
17-Heterocyclyl-5.alpha.-14.beta.-androstane, androstene and androstadiene of formula (I): ##STR1## wherein: Y is oxygen or guanidinoimino, when a double bond exists at position 3;Y is hydroxy, OR.sup.2 or SR.sup.2, when a single bond exists at position 3;R is a saturated or unsaturated mono- or biheterocyclic ring, containing one or more heteroatoms selected from the group consisting of oxygen, sulfur, and nitrogen, unsubstituted or substituted by one or more of halogen, hydroxymethyl, alkoxy, amino, alkylamino, dialkylamino, cyano, nitro, sulfonamido, C.sub.1 -C.sub.6 lower alkyl or COR.sup.3 ; andR.sup.1 is hydrogen, methyl, ethyl or n-propyl substituted by OH or NR.sup.4 R.sup.5.