共查询到17条相似文献,搜索用时 110 毫秒
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对氨基苯甲脒盐酸盐的合成 总被引:2,自引:0,他引:2
介绍了以对硝基苯甲腈为原料,经加成、胺化和还原反应合成对氨基苯脒盐酸盐的方法,将加成、胺化与还原反应改用一锅法,产品总收率达到67%。 相似文献
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三丙酮胺精制方法研究 总被引:1,自引:0,他引:1
论述了三丙酮胺纯度对加氢和还原胺化反应的影响。使用纯度较高的三丙酮胺有利于加氢和还原胺化反应的进行及产品的分离。确定了以丙酮为溶剂的重结晶方法提纯三丙酮胺,可使三丙酮胺质量分数达到98.6%。结晶母液可以不经分离,而直接用于合成三丙酮胺 相似文献
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丙二酰氧基硼氢化钠介入的醛、酮还原胺化反应 总被引:2,自引:0,他引:2
叙述了在原位生成的丙二酰氧基硼氢化钠存在下的醛、酮还原胺化反应。讨论了还原胺化的反应条件和立体位阻效应,发现丙二酰氧基硼氢化钠是一个高选择性还原剂,在给定条件下不发生自身还原反应。 相似文献
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胺型离子液体形貌可控水热法合成微纳米氧化锌 总被引:1,自引:0,他引:1
以醋酸锌和氢氧化钠为原料、以胺型离子液体和水的混合物为介质,采用水热法合成了不同形貌的氧化锌微纳米材料,通过X-射线衍射仪(XRD)、扫描电子显微镜(SEM)和紫外可见光谱(UV-Vis)对产物进行了表征,研究了离子液体种类和用量、反应时间对产物形貌和光学性质的影响。结果表明,胺型离子液体对微纳米氧化锌的形貌有重要影响,当反应介质中存在直链和支链型离子液体时,分别获得了棒状和花状结构的微纳米氧化锌。初步提出了胺型离子液体对微纳米氧化锌形貌可控的机理。 相似文献
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胺类化合物是一类重要的化工原料和中间体,在农药、医药、染料、高分子聚合物等领域有着广泛的应用。通过羰基化合物(醛或酮类)的还原胺化来制备胺类化合物是当前的研究热点。研究表明,贵金属基和非贵金属基的多相和均相催化剂均能够高效催化醛或酮类的还原胺化反应。本文对近年来羰基化合物直接还原胺化(或一锅法)合成伯胺的研究现状进行了综述,包括还原胺化反应、催化剂、反应条件、底物适用范围和催化作用机制等,其中重点阐述了直接还原胺化催化剂的研究进展。文章指出:通常多相催化剂具有活性高以及可重复使用等优点,而均相催化剂的优势在于催化效率高,伯胺选择性高;另一方面,以Pd、Rh、Ru等为代表的贵金属催化剂催化性能优异,但价格昂贵,因此可采用Co、Ni等性能同样优异但价格相对低廉的非贵金属催化剂以降低成本。文中提出,催化效率高、反应条件温和、普适性高的羰基化合物还原胺化催化剂应成为未来重点研究方向。 相似文献
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Palladium exchanged molybdophosphoric acid supported on silica is reported as a highly effective catalyst for direct reductive amination of carbonyl compounds. The catalysts are characterized by X-ray diffraction and FT-infrared spectroscopy. The characterization results support the existence of Keggin ion of heteropoly molybdate on silica. The catalyst is facile, water tolerable and environmentally benign for reductive amination. A variety of secondary and tertiary amines can be synthesized over this catalyst in excellent yields under mild reaction conditions. A plausible reaction mechanism is proposed for the reductive amination of carbonyl compounds over this catalyst. 相似文献12.
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有机胺在化工、医药、生命科学等领域有着广泛的应用,可作为染料、日用品原料以及抗生素、生物碱、临床医学药物等。在众多胺类化合物中,伯胺是最基础的结构单元,其应用在胺类化合物中也最为广泛。随着经济社会的快速发展与人们生活质量的提高,伯胺,尤其是脂肪伯胺的市场需求量与日俱增,脂肪伯胺的合成及工业化制备已成为一个重要领域。经过了数十年的发展,脂肪伯胺的生产技术已经取得了巨大的成果,但仍然存在一些问题,例如苛刻的反应条件、催化剂性能不足、污染严重、工艺复杂等。本文以脂肪伯胺的工业生产以及热点制备方法为研究对象,针对工业上制备脂肪伯胺的工艺进行了汇总归纳(包括卤代烃胺化法、醇还原胺化法,腈加氢还原法、烯烃直接胺化法、羧酸胺化法等),并举例说明各制备方法在工业生产中的实际应用,分析比较各工艺方案的优劣,并对当前的研究热点——通过羰基还原胺化制备脂肪伯胺的方法进行了研究进展的阐述,指出该制备方法在未来工业应用的潜力与挑战。 相似文献
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Photometric Characterization of the Reductive Amination Scope of the Imine Reductases from Streptomyces tsukubaensis and Streptomyces ipomoeae 下载免费PDF全文
Philipp Matzel Lukas Krautschick Prof. Matthias Höhne 《Chembiochem : a European journal of chemical biology》2017,18(20):2022-2027
Imine reductases (IREDs) have emerged as promising enzymes for the asymmetric synthesis of secondary and tertiary amines starting from carbonyl substrates. Screening the substrate specificity of the reductive amination reaction is usually performed by time-consuming GC analytics. We found two highly active IREDs in our enzyme collection, IR-20 from Streptomyces tsukubaensis and IR-Sip from Streptomyces ipomoeae, that allowed a comprehensive substrate screening with a photometric NADPH assay. We screened 39 carbonyl substrates combined with 17 amines as nucleophiles. Activity data from 663 combinations provided a clear picture about substrate specificity and capabilities in the reductive amination of these enzymes. Besides aliphatic aldehydes, the IREDs accepted various cyclic (C4–C8) and acyclic ketones, preferentially with methylamine. IR-Sip also accepted a range of primary and secondary amines as nucleophiles. In biocatalytic reactions, IR-Sip converted (R)-3-methylcyclohexanone with dimethylamine or pyrrolidine with high diastereoselectivity (>94–96 % de). The nucleophile acceptor spectrum depended on the carbonyl substrate employed. The conversion of well-accepted substrates could also be detected if crude lysates were employed as the enzyme source. 相似文献
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研究了Bronsted酸离子液体催化下醛、酮、胺的三组分Mannich反应. 在所选取的离子液体体系3-丁基-1-甲基咪唑四氟硼酸盐(BMImBF4)/3-丁基-1-甲基咪唑磷酸二氢盐(BMImH2PO4)及1-乙基咪唑三氟乙酸盐(HEImTA)中,不需要加入酸性催化剂,在室温(25 ℃)下即可高收率和高选择性地得到Mannich产物.离子液体体系经过简单的处理即可实现回收利用.对于上述体系所适用的反应底物范围亦进行了探讨. 相似文献
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Atul Kumar Siddharth Sharma Ram Awatar Maurya 《Advanced Synthesis \u0026amp; Catalysis》2010,352(13):2227-2232
We have successfully developed a single nucleotide (adenosine 5′‐diphosphate)‐catalyzed enantioselective direct reductive amination of aldehydes and ketones using a Hantzsch ester as reducing agent. The process is a simple, efficient and a real mimic of the NADH reduction approach for the synthesis of structurally diverse amines. This reaction is the first report demonstrating the ability of a single nucleotide as catalyst and one of the most genuine biomimetic reactions of organic chemistry. 相似文献
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Ruthenium carbonyl-complex catalyzed hydroaminomethylation of olefins with carbon dioxide and amines
Use of carbon dioxide as a reactant instead of toxic carbon monoxide in the hydroaminomethylation reaction sequence is demonstrated for the first time. The present Ru3(CO)12-catalyzed one-pot protocol includes reverse-water–gas-shift (RWGS) reaction, hydroformylation reaction and reductive amination which finally leads to secondary and tertiary amine. The influence of various reaction parameters including the effects of catalytic promotors and phase-transfer-catalysts has been investigated. Finally, an optimum reaction conditions were found by suppressing the major side products to have a variety of amines in excellent yields (up to 98%). 相似文献