共查询到18条相似文献,搜索用时 203 毫秒
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近年来,手性磷酸被广泛应用于催化不对称反应。通过以手性(R)-BINOL为原料,在联萘骨架的3,3’-位上通过醚化、取代、磷酸化等制备得到喹啉取代的新型含联萘骨架的手性Brnsted酸催化剂。所有化合物的结构用核磁碳谱、氢谱对进行了标征鉴定。我们并对目标化合物的刚性结构进行了讨论。 相似文献
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《制药原料及中间体信息》2006,(8):21-24
全世界已经上市销售的药物总数有1850种,手性药物占1045种,其中天然及非合成药物(523种)99%为手性药物,合成药物(1327种)其中手性药物为40%,但合成手性药物中以单一异构体销售的药物很少。只占其12%。 相似文献
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氢键催化在不对称有机催化领域已经有了重大进展.手性有机小分子通过氢键活化羰基化合物和亚胺等得到极大的关注.主要对手性硫脲和二醇催化剂的氢键催化进行综述.重点介绍不同手性硫脲和二醇催化剂的催化活性及其在各类不对称催化反应中(包括不对称Strecker反应、Pictet-Spengler反应、Mannich反应、Baylis-Hillman反应、Diels-Alder反应以及Michael反应)的催化效果. 相似文献
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不对称合成是当前有机合成中热门研究领域,利用手性金属络合物催化剂催化不对称硅氢化、烷基化,以烯烃、酮、亚胺、醛等合成手性醇、手性胺、手性酮等具有很好的工业应用前景。本文论述了手性金属络合物催化剂在不对称硅氢化反应及其在二烷基锌对醛的不对称烷基化反应中的应用。 相似文献
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手性膦配体的合成及应用是不对称有机合成和催化研究中非常重要的领域,本文综述了近几年膦配体的发展过程及手性膦配体的研究进展。 相似文献
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以金鸡纳碱衍生物为催化剂,采用不对称Mannich反应,在催化剂3-((3,5-二(三氟甲基)苯基)氨基)-4-(((1S)-6-甲氧基喹啉-4-基)((1S,4S,5R)-5-乙烯基奎宁-2-基)甲基)氨基)-3-环丁烯-1,2-二酮(Ⅴe)摩尔分数为10%,溶剂为甲苯,温度为60℃的最佳反应条件下一锅法合成了9个手性含1,3,4-噻二唑的丙二酸酯衍生物(Ⅳa~i),具有较高的收率(70%~89%)和优异的对映选择性(e.e.值最高>99%)。生物活性测试结果表明:该类衍生物对烟草花叶病毒具有一定的活性,其中,手性化合物(–)-Ⅳf〔(–)-二乙基-2-((3,4-二氯苯基)((5-(2,4-二氯苯基)-1,3,4-噻二唑-2-基)氨基)甲基)丙二酸酯〕的治疗活性和保护活性分别为50.8%和42.6%,与对照商品化药剂病毒唑相当。 相似文献
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Michael J. Abrahamson John W. Wong Andreas S. Bommarius 《Advanced Synthesis \u0026amp; Catalysis》2013,355(9):1780-1786
The reductive amination of ketones to produce chiral amines is an important transformation in the production of pharmaceutical intermediates. Therefore, industrially applicable enzymatic methods that enable the selective synthesis of chiral amines could be very useful. Using a phenylalanine dehydrogenase scaffold devoid of amine dehydrogenase activity, a robust amine dehydrogenase has been evolved with a single two‐site library allowing for the direct production of (R)‐1‐(4‐fluorophenyl)‐propyl‐2‐amine from para‐fluorophenylacetone with a kcat value of 6.85 s−1 and a KM value of 7.75 mM for the ketone substrate. This is the first example of a highly active amine dehydrogenase capable of accepting aliphatic and benzylic ketone substrates. The stereoselectivity of the evolved amine dehydrogenase was very high (>99.8% ee) showing that high selectivity of the wild‐type phenylalanine dehydrogenase was conserved in the evolution process. When paired with glucose/glucose dehydrogenase, NADH cofactor can be effficiently regenerated and the reaction driven to over 93% conversion. The broad specificity, high selectivity, and near complete conversion render this amine dehydrogenase an attractive target for further evolution toward pharmaceutical compounds and subsequent application. 相似文献
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Chiral aromatic alcohols are the key chiral building block for many important enantiopure pharmaceu-ticals. In this work,we studied asymmetric reduction of prochiral aromatic ketone to produce the corresponding chiral alcohol using vegetables as the biocatalyst. Acetophenone was chosen as the model substrate. The results in-dicate that acetophenone can be reduced to the corresponding chiral alcohols with high enantioselectivity by the chosen vegetables,i.e. apple(Malus pumila),carrot(Daucus carota),cucumber(Cucumis sativus),onion(Allium cepa),potato(Soanum tuberosum),radish(Raphanus sativus),and sweet potato(Ipomoea batatas) . In the reaction,R-1-phenylethanol is produced with apple,sweet potato and potato as the catalyst,while S-1-phenylethanol is the product with the other vegetables as the catalyst. In term of the enantioselectivity and reaction yield,carrot(D. ca-rota) is the best catalyst for this reaction. Furthermore,the reaction characteristics were studied in detail using car-rot(D. carota) as the biocatalyst. The effects of various factors on the reaction were investigated and the optimal reaction conditions were determined. Under the optimal reaction conditions(reaction time 50 h,substrate concen-tration 20 mmol·L-1,reaction temperature 35 °C and pH 7),95% of e.e.(to S-1-phenylethanol) and 85% chemical yield can be obtained. This work extends the biocatalyst for the asymmetric reduction reaction of prochiral aromatic ketones,and provides a novel potential route to produce enantiopure aromatic alcohols. 相似文献