摘要:
The present invention provides a method of crystallization of bicalutamide comprising adding an acetone solution containing bicalutamide to water; crystals of bicalutamide wherein particle size distribution of the crystals is 1 to 10 μm of Dp10, 10 to 25 μm of Dp50 and 25 to 100 μm of Dp90, and the crystals are obtainable by the method described above; and crystals of bicalutamide, wherein particle size distribution of the crystals is 1 to 3 μm of Dp10, 2 to 5 μm of Dp50 and 5 to 15 μm of Dp90.
摘要:
The present invention provides a process for recovering 1,3-dimethyl-2-imidazolidinone comprising extracting 1,3-dimethyl-2-imidazolidinone from an aqueous solution containing it with n-butanol in the presence of an inorganic salt to obtain n-butanol layer and, subjecting the n-butanol layer to distillation.As 1,3-dimethyl-2-imidazolidinone can be recoverable at high purity from an aqueous solution containing 1,3-dimethyl-2-imidazolidinone easily and efficiently without using alkali, the present process is industrially advantageous.
摘要:
The present invention relates to a production method of (R)-3-hydroxy-3-(2-phenylethyl)hexanoic acid which comprises optical resolution of racemic 3-hydroxy-3-(2-phenylethyl)hexanoic acid with an optically active amine of the formula (VIII) wherein R2 is 3,4-dimethoxyphenyl or 2-chlorophenyl. According to the present invention, (R)-3-hydroxy-3-(2-phenylethyl)hexanoic acid useful as a starting material of a pharmaceutical agent can be efficiently produced with a high optical purity and a relatively high total yield.
摘要:
A process for preparing tert-butyl 4′-methyl-2-biphenylcarboxylate characterized in that 4′-methyl-2-biphenylcarboxylic acid is reacted with isobutene in the presence of an acid catalyst. According to the present invention, tert-butyl 4′-methyl-2-biphenylcarboxylate having high quality can be conveniently and industrially advantageously prepared in a high yield under mild reaction conditions such as ambient temperatures without complicated procedures or any hazardous solvents.
摘要:
An amine of the formula, ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are each hydrogen, alkyl or the like and n is 1, 2 or 3, including .alpha.-phenyl-.beta.-(p-tolyl)-ethylamine, which is useful as an optically resolving agent, an intermediate of medicines and the like, is effectively produced by a novel process comprising hydrolysis of the corresponding nitrile of the formula, ##STR2## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and n are the same as above, followed by alkali-decomposition of the resulting amide of the formula, ##STR3## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and n are the same as above. An amide including the above one is effectively produced by hydrolysis of the corresponding nitrile in the presence of a base and hydrogen peroxide using an organic quaternary ammonium salt and/or a tertiary amine as a catalyst.
摘要:
A process for preparing a tert-alkyl carboxylic acid ester represented by the formula (III): wherein R1 is an organic group; and each of R2 and R3 is independently an alkyl group having 1 to 4 carbon atoms, comprising reacting a carboxylic acid represented by the formula (I): R1—COOH (I) wherein R1 is as defined above, with a vinylidene compound represented by the formula (II): wherein R2 and R3 are as defined above, in the presence of a phosphorus halide. The tert-alkyl carboxylic acid ester can be used as intermediates for pharmaceuticals such as antibiotics.
摘要:
A piperidine derivative, which can be used as an intermediate for pharmaceuticals such as paroxetine useful as antidepressants, represented by the general formula (I): ##STR1## wherein R.sup.1 is hydrogen atom, benzyloxycarbonyl group or tert-butoxycarbonyl group; R.sup.2 is hydroxymethyl group, an alkylsulfonyloxymethyl group having an alkyl moiety of 1 to 2 carbon atoms, phenylsulfonyloxymethyl group which may have methyl group at the 4-position, (3,4-methylenedioxyphenyl)oxymethyl group, carboxyl group or --CO.sub.2 R.sup.7 group in which R.sup.7 is an alkyl group having 1 to 5 carbon atoms, and Z is methylene group or carbonyl group.
摘要翻译:哌啶衍生物,其可以用作药物的中间体,例如用作抗抑郁药的帕罗西汀,由通式(I)表示:其中R1是氢原子,苄氧基羰基或叔丁氧基羰基; R2是羟甲基,具有1〜2个碳原子的烷基部分的烷基磺酰氧基甲基,4-位可具有甲基的苯基磺酰氧基甲基,(3,4-亚甲二氧基苯基)氧甲基,羧基或-CO 2 R 7基,其中 R 7为碳原子数为1〜5的烷基,Z为亚甲基或羰基。
摘要:
A novel process for preparing 2-cyclopentenones of the formula: ##STR1## wherein R.sub.1 is hydrogen, alkyl or alkenyl and R.sub.2 is alkyl, alkenyl, alkynyl, cycloalkyl, aryl or aralkyl, which comprises esterifying a mixture of a 3-hydroxy-4-cyclopentenone of the formula: ##STR2## wherein R.sub.1 and R.sub.2 are each as defined above and a 4-hydroxy-2-cyclopentenone of the formulas: ##STR3## wherein R.sub.1 and R.sub.2 are each as defined above with an aliphatic carboxylic acid to give a mixture of the 4-hydroxy-2-cyclopentenone (III) and the cyclopentenone ester of the formula: ##STR4## wherein R.sub.1 and R.sub.2 are each as defined above and R is hydrogen or C.sub.1 -C.sub.4 alkyl and subjecting the resulting mixture to reduction.
摘要:
A method for producing N-methacryloyl-4-cyano-3-trifluoromethylaniline, wherein 4-cyano-3-trifluoromethylaniline is crystallized from a mixed solvent of methanol and water, and the obtained 4-cyano-3-trifluoromethylaniline is reacted with methacryloyl chloride improved separation property even in industrial production in a large scale.
摘要:
The present invention provides a method of crystallization of bicalutamide comprising adding an acetone solution containing bicalutamide to water; crystals of bicalutamide wherein particle size distribution of the crystals is 1 to 10 μm of Dp10, 10 to 25 μm of Dp50 and 25 to 100 μm of Dp90, and the crystals are obtainable by the method described above; and crystals of bicalutamide, wherein particle size distribution of the crystals is 1 to 3 μm of Dp10, 2 to 5 μm of Dp50 and 5 to 15 μm of Dp90.