Abstract: There is provided a novel method for producing solifenacin or a salt thereof which is useful as a medicine, particularly a therapeutic agent and/or a preventive agent for a urinary organ system disease such as pollakiuria or urinary incontinence. Illustratively, there are provided (1) a method for producing solifenacin in which 2-(1H-Imidazolylcarbony1)-1-phenyltetrahydroisoquinoline is used as the starting material, (2) a method for producing solifenacin succinate in which (1RS)-phenyltetrahydroisoquinoline-carboxylic acid quinuclidinyl ester is used as the starting material, (3) a method for producing solifenacin in which a lower alkyl quinuclidinyl carbonate is used as the starting material and (4) a method for producing solifenacin in which phenyltetrahydroisoquinoline-carboxylic acid secondary lower alkyl or tertiary lower alkyl ester is used as the starting material and allowed to react with an alkali metal lower alkoxide.

Abstract: To provide a novel process for producing ramosetron or its salt that is useful as a pharmaceutical, especially as a therapeutic and/or preventive agent for digestive symptoms caused by administration of an anti-malignant tumor agent, diarrheal-type irritable bowel syndrome, diarrheal symptoms of irritable bowel syndrome, etc. Ramosetron or its salt can be produced by reacting a compound of the formula (I): [wherein X is a halogen] or a salt thereof with 1-methyl-1H-indole in the presence of a Lewis acid selected from the group consisting of a lower alkylaluminum dihalide, a di-lower alkylaluminum halide, a tri-lower alkylaluminum and a lower alkylaluminum sesquihalide.

Abstract: [Problems] To provide a novel process for producing ramosetron or its salt that is useful as a pharmaceutical, especially as a therapeutic and/or preventive agent for digestive symptoms caused by administration of an anti-malignant tumor agent, diarrheal-type irritable bowel syndrome, diarrheal symptoms of irritable bowel syndrome, etc. [Means for Resolution] Ramosetron or its salt can be produced by reacting a compound of the formula (I): [wherein X is a halogen] or a salt thereof with 1-methyl-1H-indole in the presence of a Lewis acid selected from the group consisting of a lower alkylaluminum dihalide, a di-lower alkylaluminum halide, a tri-lower alkylaluminum and a lower alkylaluminum sesquihalide.

Abstract: A solifenacin succinate-containing composition with less impurities which can be used as a bulk for pharmaceutical is provided. The solifenacin succinate-containing composition of the present invention has a reduced content of especially its optical isomers in comparison with the known compositions containing an acid addition salt of solifenacin, so that it can be used for production of a therapeutic agent containing solifenacin succinate. In addition, the above-described solifenacin succinate-containing composition can be easily produced in accordance with the production method of the present invention.

Abstract: A process for producing an azulene derivative useful as a Na+-glucose cotransporter inhibitor, which is high in yield, is simple in operation, is low in cost, is suited for environmental protection, and is advantageous industrially, the process being characterized by reducing and deprotecting at least one compound selected from penta-acyl compounds and tetra-acyl compounds or salts thereof to obtain a C-glycoside compound; and a useful intermediate for synthesis of such an azulene derivative, obtained in the course of the above process.

Abstract: To provide a novel method for producing a composition comprising solifenacin or a salt thereof, and a composition comprising solifenacin or a salt thereof as produced by the method, wherein an optionally substituted lower alkyl is added to the 2-position of the quinuclidine of solifenacin. The composition of the present invention contains a highly pure solifenacin, while the unexpected compounds specific to the method in an extremely low content, so that it has very preferable properties as a bulk for pharmaceutical products.

Abstract: There is provided a novel method for producing solifenacin or a salt thereof which is useful as a medicine, particularly a therapeutic agent and/or a preventive agent for a urinary organ system disease such as pollakiuria or urinary incontinence. Illustratively, there are provided (1) a method for producing solifenacin in which 2-(1H-imidazolylcarbonyl)-1-phenyltetrahydroisoquinoline is used as the starting material, (2) a method for producing solifenacin succinate in which (1RS)-phenyltetrahydroisoquinoline-carboxylic acid quinuclidinyl ester is used as the starting material, (3) a method for producing solifenacin in which a lower alkyl quinuclidinyl carbonate is used as the starting material and (4) a method for producing solifenacin in which phenyltetrahydroisoquinoline-carboxylic acid secondary lower alkyl or tertiary lower alkyl ester is used as the starting material and allowed to react with an alkali metal lower alkoxide.