Neurotropic and psychotropic agents. V. An improved synthesis of 7-chloro-5-(2-chlorophenyl)-2-(2-dimethylaminoethylthio)-3H-1,4-benzodiazepine and related compounds.
Neurotropic and psychotropic agents. IV. Synthesis and pharmacological properties of 7-chloro-5-(2-chlorophenyl)-2-(2-dimethylaminoethylthio)-3H-1,4-benzodiazepine and related compounds.
作者:MASAAKI MATSUO、KIYOSHI TANIGUCHI、IKUO UEDA
DOI:10.1248/cpb.30.1141
日期:——
The synthesis and pharmacological properties of 7-chloro-5-(2-chlorophenyl)-2-(2-dimethylaminoethylthio)-3H-1, 4-benzodiazepine (III-1) and related compounds are described. Compound III-1 was prepared from the thiolactam (II-1) by treatment with 2-dimethylaminoethyl chloride in the presence of base in aqueous methanol and 7-chloro-5-(2-ohlorophenyl)-2-methoxy-3H-1, 4-benzodiazepine (IV) was obtained as a by-product. The latter (IV) was hydrolyzed in acid medium to give methyl (E)-[2-amino-5-chloro-α-(2-chlorophenyl) benzylidene] aminoacetate (syn-form) (XIX), which was converted into the 1, 4-benzodiazepine (I-1) by further acid treatment. Compound XIX isomerized to the corresponding anti-form (XXII) on heating. Most of the compounds prepared had an effect similar to that of diazepam in causing taming and anticonvulsant effects in mice.
Neurotropic and psychotropic agents. V. An improved synthesis of 7-chloro-5-(2-chlorophenyl)-2-(2-dimethylaminoethylthio)-3H-1,4-benzodiazepine and related compounds.
An improved method for the synthesis of 7-chloro-5-(2-chlorophenyl)-2-(2-dimethylaminoethylthio)-3H-1, 4-benzodiazepine (IIa) and related compounds is described. IIa was obtained in 75.1% yield by the reaction of the 1, 4-benzodiazepin-2-one (Ia) with 2-dimethylaminoethanethiol in the presence of titanium tetracbloride ; a small amount of 7-chloro-5-(2-chlorophenyl)-2-dimethylamino-3H-1, 4-benzodiazepine (III) was obtained as a byproduct. A mechanistic interpretation of the formation of III is presented.