摘要:
Optically active diphenylalanine compounds may be conveniently prepared in a good yield by reacting a diphenylalanine compound represented by formula (1) with an optically active amine compound represented by formula (2) in the presence of an organic solvent to give a diastereomeric salt represented by formula (5) and then treating the diastereomeric salt under acidic conditions to give an optically active diphenylalanine compound represented by formula (3): wherein each symbol is as defined in the specification.
摘要:
Optically active diphenylalanine compounds may be conveniently prepared in a good yield by reacting a diphenylalanine compound represented by formula (1) with an optically active amine compound represented by formula (2) in the presence of an organic solvent to give a diastereomeric salt represented by formula (5) and then treating the diastereomeric salt under acidic conditions to give an optically active diphenylalanine compound represented by formula (3): wherein each symbol is as defined in the specification.
摘要:
The present invention provides a production method including reacting a diphenylmethylene halide compound represented by the following formula (1) with a malonic acid diester compound represented by the following formula (2) in an organic solvent selected from N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone and N,N-dimethylformamide, in the presence of a base selected from an alkali metal hydride and an alkali metal t-butoxide to give a diester compound represented by the following formula (3), and then subjecting the diester compound to hydrolysis and decarboxylation to give a diphenylalanine compound represented by the following formula (4). According to the present invention, diphenylalanine compound (4) can be obtained industrially advantageously in a high yield. wherein each symbol is as defined in the specification.
摘要:
The present invention relates to a method of producing a compound represented by the formula [I] or a salt thereof, which comprises reacting a compound represented by the formula [II] or a salt thereof with a compound represented by the formula [III] or a salt thereof, in the presence of a base, in alcohol, and provides a production method of an O-substituted tyrosine compound, which is superior in productivity, versatility and safety, and economically and industrially useful: wherein each symbol is as defined in the specification.
摘要:
The present invention provides a production method including reacting a diphenylmethylene halide compound represented by the following formula (1) with a malonic acid diester compound represented by the following formula (2) in an organic solvent selected from N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone and N,N-dimethylformamide, in the presence of a base selected from an alkali metal hydride and an alkali metal t-butoxide to give a diester compound represented by the following formula (3), and then subjecting the diester compound to hydrolysis and decarboxylation to give a diphenylalanine compound represented by the following formula (4).According to the present invention, diphenylalanine compound (4) can be obtained industrially advantageously in a high yield. wherein each symbol is as defined in the specification.
摘要:
An optically active compound (I) is reacted with compound (II) to give optically active compound (III), which is subjected to alkali hydrolysis and deprotection when R1 is alkyl: wherein X is a chlorine atom and the like, and R1, R2 and R3 are each an alkyl group and the like, or racemic compound (I) is reacted with compound (II) to give racemic compound (III), which is asymmetrically hydrolyzed by an enzyme to perform optical resolution, and subjected to alkali hydrolysis and deprotection: wherein X is a chlorine atom and the like and R1, R2 and R3 are each an alkyl group and the like.
摘要翻译:使光学活性化合物(I)与化合物(II)反应,得到光学活性化合物(III),当R 1为烷基时,其进行碱水解和脱保护:其中X为氯原子 R 1,R 2,R 3和R 3各自为烷基等,外消旋化合物(I)为 与化合物(II)反应,得到外消旋化合物(III),其由酶不对称水解以进行光学拆分,并进行碱水解和脱保护:其中X是氯原子等,R 1, R 2,R 2和R 3各自为烷基等。
摘要:
The present invention relates to a method of producing a compound represented by the formula [I] or a salt thereof, which comprises reacting a compound represented by the formula [II] or a salt thereof with a compound represented by the formula [III] or a salt thereof, in the presence of a base, in alcohol, and provides a production method of an O-substituted tyrosine compound, which is superior in productivity, versatility and safety, and economically and industrially useful: wherein each symbol is as defined in the specification.
摘要:
A process for preparing optically active 2-hydroxymethyl-3-phenylpropionic acid by resolving (RS)-2-hydroxymethyl-3-phenylpropionic acid via crystallization of an optically active amine salt, where the amine is optically active cis-1-amino-2-indanol salt, optically active .alpha.-methylbenzylamine salt, or optically active 3-methyl-2-phenyl-1-butylamine salt.
摘要:
A panel instrument apparatus of reduced size, comprising a printed circuit board on which light emitting elements and switches are mounted, and a panel cover to the rear of which the front face of the printed circuit board is attached. The panel cover comprises reflecting holes arranged in positions corresponding to the light emitting elements on the printed circuit board to guide light from the light emitting elements to the surface of the panel cover; and furthermore comprises resilient links and coupled thereto keys which are located in positions corresponding to the switches on the printed circuit board.
摘要:
The present invention relates to a method of producing a highly pure crystal, which includes crystallization of a benzenesulfonamide derivative of the following formula (1) using a polar solvent as a good solvent (e.g., alcohol or a mixed solvent of alcohol and water) and water as a poor solvent, and a novel crystal of a nitrobenzenesulfonamide derivative of the following formula (2), which is an intermediate for the derivative, and a production method thereof: