- Preparation method for (S)-1-phenyl-1,2,3,4-tetrahydroisoquinoline
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The invention relates to a medical intermediate, in particular to a preparation method for (S)-1-phenyl-1,2,3,4-tetrahydroisoquinoline. Benzoyl chloride or benzoic acid, phenylethylamine, alkali metalhydroxide and water are mixed to react, N-(2-phenethyl)benzamide, phosphorus pentoxide and phosphorus chloride at a certain ratio are mixed and heated with organic solvent, obtained 1-phenyl-3,4-dihydroisoquinoline, a first alcohol solvent and borohydride are mixed to react, the obtained 1-phenyl-1,2,3,4-dihydroisoquinoline, a second alcohol solvent, water and D-tartaric acid are mixed and heatedto react, the obtained (S)-1-phenyl-1,2,3,4-tetrahydroisoquinoline tartrate, alkali metal hydroxide and water are mixed to obtain a target product. The preparation method for (S)-1-phenyl-1,2,3,4-tetrahydroisoquinoline has the advantages of simpleness in operation and aftertreatment.
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Paragraph 0026
(2019/03/31)
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- Solifenacin succinate raw medicine synthesis process
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The invention discloses a solifenacin succinate raw medicine synthesis process. 2-phenylethylamine and 3-quinuclidinone hydrochloride are respectively used as starting raw materials for synthesizing afragment A and a fragment B; then, condensation reaction occurs to generate solifenacin; through salt formation, the solifenacin succinate is obtained. The process is characterized in that straight-chain paraffin and water are used as reaction solvents; alkali metal hydroxides or carbonate and bicarbonates of the alkali metal hydroxides are used as acid-binding agents; phenylethylamine and benzoyl chloride take acylation reaction to generate midbodies 1 of solid precipitation fragments A insoluble in reaction solvents; in the post treatment process, filtering is directly performed; isomers ofthe fragment A are subjected to catalytic racemization through alkali metal hydroxides by using dimethylsulfoxide as a solvent, so that the byproduct isomers can be recovered and utilized; in the second-step reaction post treatment of the fragment B, a conventional pressure reduced distillation method is used for obtaining high-purity and high-yield 3-acetoxyquinine acetate. The invention provides a novel synthesis process with the advantages of high yield and economic and environment-friendly effects, and is suitable for industrial mass production.
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- 1-phenyl -1, 2, 3, 4-isoquinoline method for the preparation of
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The invention provides a 1-phenyl-1, 2, 3, 4-tetrahydroisoquinoline preparation method. The 1-phenyl-1, 2, 3, 4-tetrahydroisoquinoline preparation method comprises the following steps of: mixing benzoyl chloride or benzoic acid, phenethylamine and alkali metal hydroxide with water, and reacting to obtain N-(2-phenethyl) benzamide; then mixing the N-(2-phenethyl) benzamide with phosphorus pentoxide, chloride phosphorus and a benzene solvent, heating and reacting to obtain 1-phenyl-3, 4-dihydro-isoquinoline; and further mixing the 1-phenyl-3, 4-dihydro-isoquinoline with a first alcohol solvent and hydroboron, and reacting to obtain the product. Compared with the prior art, the 1-phenyl-1, 2, 3, 4-tetrahydroisoquinoline preparation method has the advantages that firstly, no organic solvents are added, the product N-(2-phenethyl) benzamide is insoluble in an aqueous solution, and therefore, the steps of skimming and the like are avoided in the after-treatment process, and the after-treatment operation is simplified; secondarily, as the organic solvents are not added, the cost is reduced, and the pollution to environments is avoided; and thirdly, as the phosphorus pentoxide and the chloride phosphorus are subjected to oxidization cyclization reaction, polyphosphoric acids are prevented from being heated and decomposed to generate hypertoxic phosphorus oxide exhaust gas.
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Paragraph 0065; 0069
(2017/01/26)
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- Engineering an enantioselective amine oxidase for the synthesis of pharmaceutical building blocks and alkaloid natural products
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The development of cost-effective and sustainable catalytic methods for the production of enantiomerically pure chiral amines is a key challenge facing the pharmaceutical and fine chemical industries. This challenge is highlighted by the estimate that 40-45% of drug candidates contain a chiral amine, fueling a demand for broadly applicable synthetic methods that deliver target structures in high yield and enantiomeric excess. Herein we describe the development and application of a "toolbox" of monoamine oxidase variants from Aspergillus niger (MAO-N) which display remarkable substrate scope and tolerance for sterically demanding motifs, including a new variant, which exhibits high activity and enantioselectivity toward substrates containing the aminodiphenylmethane (benzhydrylamine) template. By combining rational structure-guided engineering with high-throughput screening, it has been possible to expand the substrate scope of MAO-N to accommodate amine substrates containing bulky aryl substituents. These engineered MAO-N biocatalysts have been applied in deracemization reactions for the efficient asymmetric synthesis of the generic active pharmaceutical ingredients Solifenacin and Levocetirizine as well as the natural products (R)-coniine, (R)-eleagnine, and (R)-leptaflorine. We also report a novel MAO-N mediated asymmetric oxidative Pictet-Spengler approach to the synthesis of (R)-harmicine.
- Ghislieri, Diego,Green, Anthony P.,Pontini, Marta,Willies, Simon C.,Rowles, Ian,Frank, Annika,Grogan, Gideon,Turner, Nicholas J.
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supporting information
p. 10863 - 10869
(2013/08/23)
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- Processes for optical resolution of 1-phenyl-1,2,3,4-tetrahydroisoquinoline
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Optically pure 1(S)-phenyl-1,2,3,4-tetrahydroisoquinoline tartrate is prepared. The 1(S)-phenyl-1,2,3,4-tetrahydroisoquinoline tartrate is particularly useful for preparing solifenacin succinate.
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Page/Page column 5
(2010/11/30)
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