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1.
不对称转换法合成D—脯氨酸   总被引:6,自引:1,他引:5  
用不对称转称的方法,以(2R,3R)-酒石酸为拆分剂,在丁醛存在下,使L-脯氨酸的消旋及D-脯氨酸与(2R,3R)-酒石酸的成盐结晶两步反应同时进行,总收率达82%。  相似文献   

2.
建立了HPLC法测定合成麻黄素的中间体[(S)-(-)-α-甲胺基苯丙酮]2-(2R,3R)-(-)-二苯甲酰酒石酸中的(S)-(-)-α-甲胺基苯丙酮和(2R,3R)·(-)-二苯甲酰酒石酸。采用C18色谱柱,以0.05mol/L磷酸二氢钾溶液-甲醇(80:20)为流动相,检测波长238nm。两者在0.05-0.20mg/ml和0.06-0.24mg/ml浓度范围内线性关系良好,回收率为99.8%和99.6%,RSD均为0.6%。  相似文献   

3.
本文将a1受体拮抗剂(±)-DDPH用(+)-酒石酸和(-)-二苯甲酰酒石酸为拆分剂拆分为(+)-DDPH体和(-)-DDPH。(-)-DDPH和(±)-DDPH拮抗a1受体激动剂苯肾上腺素作用强度相近,PA2值分别为7.69和7.55。  相似文献   

4.
经7步反应合成了中间体2,设计并合成了手性(S)-2-甲氧基环己酮(6),并最后合成了tribactam的关键中间体(3S,4R)-3-[(R)-1(叔丁基二甲基硅氧基)乙基]4-{R)-2′-[(S)-6′-(2)′-甲氧基)-1′-氧代环己基]}-2-氮杂环丁酮(1)。合成路线短,收率高,成本低。  相似文献   

5.
以2-甲基-3-羰基丁酸乙酯为原料,以面包酵母为生物催化剂,采用化学-生物法合成了光学纯(4R,5S)-5-羟基-3-羰基-4-甲基己酸(99.2%ee)。  相似文献   

6.
以L(+)-酒石酸和D(-)-酒石酸为拆分剂,将氯胺酮拆分为具有光学活性的S(+)和R(-)异构体,分别得到了S(+)和R(-)型盐酸氯胺酮单体。  相似文献   

7.
(2R,3R)—酒石酸二甲酯制备的改进   总被引:1,自引:0,他引:1  
(2R,3R)┐酒石酸二甲酯制备的改进IMPROVEDPREPARATIONOF(2R,3R)┐TARTARICACIDDIMETHYLESTER南柱石胥波(湖北制药厂医药研究所,襄樊441023)NANZhu-Shi,XUBo(Instituteo...  相似文献   

8.
报道以(一)-奎尼酸为手性源有效地合成(1R,2R,4S,5R)-1,4-二羟基-3-二苯叔丁硅氧基-6-氧代双环[3.2.1]-辛-7-酮的方法。  相似文献   

9.
从广西特有的前胡属植物马山前胡Peucedanum mashanense Shan et Sheh根中首次分得10个化合物晶体,经理化常数和波谱解析,分别鉴定为3′(R)-( )-亥茅酚(1)、3′(S)-(-)-亥茅酚(2)、印度枸桔素(3)、石防风素(4)、珊瑚菜素(5)、水合氧化前胡素(6)、佛手柑内酯(7)、β-谷甾醇(8)、褐煤酸(9)和甘露醇(10),其中化合物1为一个新天然产物。  相似文献   

10.
目的:改进(1R,2S)-2-氨基-1-苯基-1-丙醇的合成工艺。方法:以苯丙酮为起始原料,经中间体肟基苯丙酮和Pt-Pd/C催化加氢反 应合成赤式2-氨基-1-苯基-1-丙酮,再用S-羧甲基-L-半胱氨酸作拆分试剂进行拆分,得到目标产物。结果:收率和光学纯度有较大提高,总收率达55.5%。结论:该工艺具有工业应用价值。  相似文献   

11.
目的设计合成新的大流量钙激活钾离子通道开放剂。方法以他莫希芬为先导化合物。采取分子间McMurry偶联反应合成15个新化合物,采用荧光分析法,利用高表达鼠的α和β1亚基的HEK293细胞对目标化合物进行活性筛选。结果与结论目标化合物结构经质谱、高分辨质谱及氢谱确证,与对照药他莫希芬相比,具有类似的大流量钙激活钾离子通道开放活性。  相似文献   

12.
本文对2′,4′-二氯苯基哒嗪衍生物对几种实验性癫痫模型的对抗作用进行了研究,其中化合物Ⅰ和Ⅱ对最大电休克发作实验(MEST),戊四唑(Met)印防己毒素发作和荷包牡丹碱发作等四种实验性癫痫模型均有很强的对抗作用,强于苯妥英钠,苯巴比妥和卡马西平,但也显示中枢抑制作用,预防指数不高,化合物Ⅲ和Ⅳ对这四种动物惊厥模型亦有较强的对抗作用,均大大强于丙戊酸钠和乙琥胺,其中化合物Ⅲ的中枢神经系统毒性较低,抗MEST的预防指数高达23.4.  相似文献   

13.
本文对2′,4′-二氯苯基哒嗪衍生物对几种实验性癫痫模型的对抗作用进行了研究,其中化合物Ⅰ和Ⅱ对最大电休克发作实验(MEST),戊四唑(Met)印防己毒素发作和荷包牡丹碱发作等四种实验性癫痫模型均有很强的对抗作用,强于苯妥英钠,苯巴比妥和卡马西平,但也显示中枢抑制作用,预防指数不高,化合物Ⅲ和Ⅳ对这四种动物惊厥模型亦有较强的对抗作用,均大大强于丙戊酸钠和乙琥胺,其中化合物Ⅲ的中枢神经系统毒性较低,抗MEST的预防指数高达23.4.  相似文献   

14.
G004, 1-(4-(2-(4-bromobenzenesulphonamino) ethyl) phenylsuphonyl)-3-(trans-4-methylcyclohexyl) urea, is being developed as a potential hypoglycaemic agent. In this study, the related compounds in the bulk drug substance of G004 were analyzed both qualitatively and quantitatively. An unknown compound in the drug, which has never been reported, was isolated using preparative liquid chromatography and characterized as 1-(4-(2-(2-bromobenzenesulphonamino) ethyl) phenylsuphonyl)-3-(trans-4-methylcyclohexyl) urea using nuclear magnetic resonance and mass spectrometry. Moreover, a reversed-phase liquid chromatography method was developed for quantification of both the major impurities and the main constituent. The proposed method was validated and applied during impurity studies and quality control analysis of the bulk drug and laboratory-prepared samples of G004.  相似文献   

15.
马蓝的化学成分研究   总被引:15,自引:0,他引:15  
Seven compounds have been isolated from the whole plant of Strobilanthes cusia (Nees) O. Ktze. Three of them are triterpenes (Ⅰ~Ⅲ), two are indole alkaloids (Ⅳ, Ⅴ), two are quinazolinone alkaloids (Ⅵ, Ⅶ). On the basis of spectral analysis and physicochemical properties, their structures were established as lupeol (Ⅰ), betulin (Ⅱ), lupenone (Ⅲ), indigo (Ⅳ), indirubin (Ⅴ), 4 (3H)-quinazolinone (Ⅵ), 2, 4 (1H, 3H)-quinazolinedione (Ⅶ). Ⅵ and Ⅶ were found from natural plant for the first time.The results of the pharmacological tests demonstrate that compound Ⅴ has anticancer activity and compound Ⅵ has hypotensive action. Compound Ⅶ can be quantitatively determined by HPLC, which may serve as a quality control standard for materia medica and its preparations. Compounds Ⅵ and Ⅶ have been confirmed by means of synthesis.  相似文献   

16.
The intestinal enterocytes provide the initial site for cytochrome P450 (CYP)-mediated metabolism of orally absorbed xenobiotics. In man and some animal species, the CYP3A subfamily is highly expressed in the intestines and considered to be important in the first-pass metabolism of drugs and other xenobiotics. The aim of the present study was to investigate the mRNA expression, immunohistochemical localization and catalytic activity of CYP3A in the intestines of horse. Real-time RT-PCR analyses showed that the highest CYP3A mRNA expression was present in the duodenum with a decreasing level towards jejunum, ileum, cecum, and colon. The CYP3A mRNA expression in the liver was similar as in the anterior part of the jejunum, but about 4.5 times lower than in the anterior part of the duodenum. Immunohistochemistry showed CYP3A immunoreactivity in the cytoplasm of the enterocytes, which decreased distally along the intestinal tract. CYP3A-dependent metabolic activity rose slightly from the anterior to the distal part of the duodenum and the anterior part of the jejunum and then declined to the middle and distal parts of the jejunum and the ileum, cecum, and colon. Our results suggest that CYP3A in the small intestine plays a major role in first-pass metabolism and may affect bioavailability and therapeutic efficiency of some orally administrated drugs in horse.  相似文献   

17.
目的 优化酒石酸唑吡坦的合成工艺.方法 以6-甲基-2-(4-甲基苯基)-咪唑并[1,2-α]吡啶为起始原料,通过缩合、还原、甲酯化、胺解、成盐5步反应合成酒石酸唑吡坦.结果 酒石酸唑吡坦总收率由30% ~ 35%提高到45%左右,副反应少,杂质简单.结论 优化后的合成工艺,操作简单、易行,工艺稳定,可满足工业化生产的要求.  相似文献   

18.
目的 设计并合成罗氟司特中3,5-二氯-4-氨基吡啶引入的两个杂质3-(环丙甲氧基)-N-(3-氯-5-溴-4-吡啶基)-4-(二氟甲氧基)苯甲酰胺和3-(环丙甲氧基)-N-(3-氯-4-吡啶基)-4-(二氟甲氧基)苯甲酰胺。方法 以4-二氟甲氧基-3-羟基苯甲醛为起始原料经过亲核取代、氧化、酰氯化和酰胺化合成了目标化合物。结果 合成了目标化合物,并利用1H-NMR、13C-NMR和MS确证了结构;HPLC归一化法测得样品质量分数分别为98.8%、99.8%。并证明这两个杂质存在于罗氟司特中。结论 这两种杂质的合成为罗氟司特中杂质的研究提供了依据。  相似文献   

19.
苏曼  刘伟  孙庆伟 《药学研究》2016,35(5):308-310
目的:研究利伐沙班的化学合成新方法。方法以对硝基苯胺为起始原料,通过开环后环合、还原制得4-(4-氨基苯基)-3-吗啉酮,再经加成、环合、脱保护、缩合4步反应生成最终产物利伐沙班。结果合成的利伐沙班的总收率为32.1%(以对硝基苯胺计),其结构经红外光谱( IR)、氢核磁共振(1 H-NMR)和质谱( MS)确证。结论本研究原料价廉易得,合成操作简单,成本低,适合工业化生产。  相似文献   

20.
匹莫苯的合成   总被引:1,自引:1,他引:0  
以3-(4-乙酰胺基苯甲酰基)-丁腈为原料,经水解、环合、酰化、硝化、还原、环合合成了匹莫苯,其中硝化反应改用混酸法,反应总收率28%.  相似文献   

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