Preparation method of N,N-dimethyl-3-hydroxy-3-aryl propyl amine
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A technology of aryl propylamine and aryl allyl amine, which is applied in the field of N, can solve the problems of low Mannich reaction yield, complex operation, and long reaction time, and achieve the effects of easy industrial production, simple preparation process, and short reaction time
Inactive Publication Date: 2006-06-14
TIANJIN UNIV
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[0005] However, the above-mentioned preparation method has shortcomings such as low Mannich reaction yield, long reaction time, complicated operation, etc., so the synthesis research of this type of intermediate is extremely important
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Embodiment 1
[0016] Add 2-acetthiophene (50.5g, 0.4mol), DMFDMA (95.2g, 0.8mol) and N,N-dimethylformamide (250ml) into the reaction flask, raise the temperature to 100°C and react for 3 hours, and then evaporate under reduced pressure. The solvent was cooled to obtain yellow crystals, which were recrystallized with ethyl acetate (400ml) to obtain light yellow crystals of N,N-dimethyl-3-oxo-3-(2-thienyl)propenamine (67.4g, 92.1) %). mp.117~119℃. MS m / z: 180.9, 148.0, 110.9, 98.0, 55.0, 42.0.
Embodiment 2
[0018] Lithium aluminum hydride (38g, 1.0mol) and tetrahydrofuran (300ml) were added to the reaction flask, and N,N-dimethyl-3-oxo-3-(2-thienyl)propenamine (36.2g, 0.2mol), after the addition, react at room temperature for 10 hours. Under cooling, slowly add water (200ml), continue to stir for 30 minutes, filter, extract the filtrate with dichloromethane (100ml×3), dry, filter, and evaporate the solvent to obtain a shallow Yellow viscous oil N,N-dimethyl-3-hydroxy-3-(2-thienyl)propylamine (33.5g, 82.4%), cooled and solidified to obtain a white solid, mp. 70-73°C. MS m / z: 185.1, 113.0, 85.0, 58.1, 30.1.
Embodiment 3
[0020] Add acetophenone (60.0, 0.5), DMFDMA (119g, 1.0mol) and N,N-dimethylformamide (300ml) into the reaction flask, heat up to 100°C and react for 4 hours, distill off the solvent under reduced pressure and cool to obtain yellow Crystallized and recrystallized from ethyl acetate (450ml) to give light yellow crystals of N,N-dimethyl-3-oxo-3-phenylpropenamine (78.9g, 90.1%). mp.93~94℃. MS m / z: 175.0, 158.0, 131.0, 98.0, 77.0, 42.0.
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Abstract
The present invention discloses a preparation method of N,N-dimethyl-3-hydroxy-3-arylpropylamine. Said method includes the following steps: adding phenyl methyl ketone or 2-acetyl thiophenol and N,N-dimethylformamide dimethyl acetal into solvent including benzene and N,N-dimethylformamide, after the reaction is completed, evaporating solvent, cooling to obtain yellow crystal product, using solvent of ethyl acetate, etc, to make recrystallization and obtain N,N-dimethyl-3-oxo-3-aryl propyleneamine; adopting lithium aluminium hydride as reducing agent, adding N,N-dimethyl-3-oxo-3-aryl propyleneamine and reducing agent into the solvents of benzene, etc., making reaction to obtain product; or adopting sodium borohydride as reducing agent, adding N,N-dimethyl-3-oxo-3-aryl propyleneamine and reducing agent into solvents of acetic acid, etc., making reaction to obtain product; making said product undergo the process of phase separation, evaporating the organic phase obtained by means of phase separation so as to obtain N,N-dimethyl-3-hydrox-3-arylpropylamine.
Description
Technical field [0001] The invention relates to a preparation method of N,N-dimethyl-3-hydroxy-3-arylpropylamine, which belongs to the preparation technology of important intermediates of a variety of antidepressants. Background technique [0002] N,N-dimethyl-3-hydroxy-3-arylpropylamine compounds are important pharmaceutical intermediates, which can be used to synthesize fluoxetine hydrochloride, atomoxetine hydrochloride, duloxetine hydrochloride and other drugs. Such drugs have been widely used in the treatment of depression and have been widely used all over the world. Therefore, a large number of literatures reported on the synthetic methods of such intermediates. [0003] Examples of known preparation methods of N,N-dimethyl-3-hydroxy-3-arylpropylamine compounds include: In many patents [US 4314081, US 4194009, and EP 529842, etc.], fluoxetine hydrochloride is described in Synthesis, the important intermediate is N,N-dimethyl-3-hydroxy-3-phenylpropylamine, which uses acetop...
Claims
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