共查询到20条相似文献,搜索用时 713 毫秒
1.
2.
3.
4.
运用拼合原理并根据构效关系研究结果,设计了香豆素噻唑烷二酮类化合物,合成方法是以甲基取代的香豆素为原料,经NBS溴化后,再与5-(4-羟基苄叉)-噻唑烷-2,4-二酮在NaH作用下缩合得到,其中中间体5-(4-羟基苄叉)-噻唑烷-2,4-二酮是由噻唑烷二酮与对羟基苯甲醛在哌啶催化下缩合得到,共合成了5-[4-(香豆素-7-亚甲氧基)苄叉]-噻唑烷-2,4-二酮、5-[4-(4-甲基香豆素-7-亚甲氧基)苄叉]-噻唑烷-2,4-二酮、5-[4-(香豆素-6-亚甲氧基)苄叉]-噻唑烷-2,4-二酮、5-[4-(7-甲氧基香豆素-4-亚甲氧基)苄叉]-噻唑烷-2,4-二酮、5-[4-(3-溴香豆素-7-亚甲氧基)苄叉]-噻唑烷-2,4-二酮、5-[4-(3-溴-4-甲基香豆素-7-亚甲氧基)苄叉]-噻唑烷-2,4-二酮6个香豆素噻唑烷二酮类化合物,结构均经IR1、HNMR、MS确定,两步反应合成目标化合物总产率分别为10.4%、13.1%、7.1%、16.0%、22.0%、18.0%。 相似文献
5.
6.
7.
8.
9.
采用N,N-二乙基间氨基苯酚为原料,合成出了一种香豆素类的红色光转换材料:3-二乙氨基-7-(2,4-二羟基酚)-6H,7H-[1]-苯并吡喃-[4,3-b]-[1]-苯并吡喃-6,10-二酮。用1HNMR,IR和元素分析对产物及中间体进行了表征。讨论了合成中间体7-二乙氨基-4-氯-3-甲醛基香豆素反应的影响因素,得出它的最佳反应条件:4-羟基香豆素:三氯氧磷=1∶2(mol);反应温度5℃;反应时间1h。研究了产物在乙醇溶液中的发光性质,结果表明,产物吸收534nm左右的绿光,发射632nm左右的红光,该波长与植物光合作用所需的红光区相吻合。 相似文献
10.
11.
7-对甲苯硫亚氨基-3-(1-甲基-1H-四唑-5-硫甲基)-3-头孢烯-4-羧基酸二苯甲酯(7-DTMC)是合成甲氧头孢菌素关键中间体7β-氨基-7α-甲氧基-3-(1-甲基-1H-四唑-5-硫甲基)-3-头孢烯-4-羧酸二苯甲酯(7-MAC)的重要中间体。采用7β-氨基-3-(1-甲基-1H-四唑-5-硫甲基)-3-头孢烯-4-羧酸二苯酯(7-DAMC)为原料,以对甲基苯硫氯(TSC)为氨基保护试剂,二氯甲烷为溶剂,1,2-环氧丙烷为催化剂和4分子筛为脱水剂剂反应制备得到7-DTMC。本文主要探讨了反应温度、反应时间、物料配比、催化剂用量等因素对反应的影响,并通过二次回归建立了数学模型,确定了合成7-DTMC的最佳工艺条件。在此基础上合成的产品收率89.71%,HPLC纯度99.34%。产品结构经1H-NMR和FT-IR表征确认。 相似文献
12.
13.
基于已报道的ALK激酶抑制剂,对NVP-TAE684进行结构改造,将起始化合物1经过胺化引入吡嗪氮杂环(2),再脱Boc反应获得胺中间体(3),最后3与亲电试剂6通过钯催化C-N偶联反应合成了2个吡嗪氮杂环修饰的嘧啶衍生物(7a,7b)。中间体2,3和目标化合物7未见文献报导,6个新化合物结构均经1H NMR、13C NMR和HRMS-ESI确定。采用MTT法考察了目标化合物对肿瘤细胞NCI-H460和NCI-H520的体外抑制活性。结果表明,化合物7a和7b对肿瘤细胞均具有明显的抑制活性,其中7a的抑制活性IC50=52.10(±0.10) nM。 相似文献
14.
Ken Shimomai Noboru Higashida Toshiaki Ougizawa Takashi Inoue Bernd Rudolf Jörg Kressler 《Polymer》1996,37(26):5877-5882
The miscibility of poly(methyl methacrylate) (PMMA) and styrene-acrylonitrile random copolymers (SAN) blends was investigated on the basis of the Flory—Orwoll—Vrij equation of state theory. To obtain the equation of state parameters (P*, V*sp, T*: characteristic parameters), the pressure—volume—temperature (PVT) behaviour was measured for PMMA and a series of SANs with various acrylonitrile contents. The exchange energy parameter Xij was also calculated by fitting the theory to some phase diagrams of PMMA/SAN blends. The Flory—Huggins interaction parameter χ was separated into two contributions based on the equation of state theory for mixtures: the exchange energy term χinter and the free volume term χfree. Both the temperature and copolymer composition dependences of χinter and χfree were estimated by calculations using the equation of state parameters. There exists a region in which χinter is negative, leading to a miscibility window in PMMA/SAN blends. However, the immiscibility at high temperatures in the blends cannot be explained only by χinter; it is caused by the free volume contribution, χfree. The miscibility window behaviour in PMMA/SAN blends may be explained within the framework of the equation of state theory. 相似文献
15.
16.
Li Qing Du Yan Wang Chang Xu Jia Cao Qin Wang Hui Zhao Fei Yue Fan Bing Wang Takanori Katsube Sai Jun Fan Qiang Liu 《International journal of molecular sciences》2013,14(12):24087-24096
The objective of this study was to investigate the underlying mechanisms behind the radiation-sensitising effects of the antennapedia proteins (ANTP)-smacN7 fusion protein on tumour cells. ANTP-SmacN7 fusion proteins were synthesised, and the ability of this fusion protein to penetrate cells was observed. Effects of radiation on the expression of X-linked inhibitor of apoptosis protein (XIAP) were detected by western blotting. The radiation-sensitising effects of ANTP-SmacN7 fusion proteins were observed by a clonogenic assay. The effects of drugs and radiation on tumour cell apoptosis were determined using Annexin V/FITC double staining. Changes in caspase-8, caspase-9 and caspase-3 were detected by western blot before and after ANTP-SmacN7 inhibition of XIAP. The ANTP-SmacN7 fusion protein could enter and accumulate in cells; in vitro XIAP expression of radiation-induced tumour cells was negatively correlated with tumour radiosensitivity. The ANTP-SmacN7 fusion protein promoted tumour cell apoptosis through the activation of caspase3. ANTP-SmacN7 fusion protein may reduce tumour cell radioresistance by inducing caspase3 activation. 相似文献
17.
目的在悬浮CHO-S细胞中稳定表达重组人骨形态发生蛋白7(recombinant human bone morphgenetic protein7,rhBMP7)成熟蛋白。方法应用RT-PCR技术从BALB/c乳鼠股骨组织扩增mbmp7基因,克隆至质粒pMD18-T,通过定点突变3个氨基酸编码序列(G266S、S287N、D359E),得到重组克隆质粒pMD18-mbmp7m3;将mbmp7m3克隆至表达载体pCHO1. 0,构建重组表达质粒pCHO-mbmp7m3,转染CHO-S细胞,利用嘌呤霉素和甲氨蝶呤进行两轮加压筛选,有限稀释法筛选单克隆细胞,ELISA法检测rhBMP7成熟蛋白的表达。结果从乳鼠股骨组织扩增的cDNA经测序与GenBank中登录的序列完全一致,点突变后测序与设计完全一致。获得了稳定表达rhBMP7成熟蛋白的单克隆细胞株,最高表达量为202 ng/mL。结论成功利用改造的mbmp7基因在CHO-S细胞中表达了rhBMP7成熟蛋白,为后续该制品工艺开发及产业化奠定了基础。 相似文献
18.
甲氧头孢菌素中间体7-AMCA的合成工艺优化 总被引:1,自引:0,他引:1
7β-氨基-3-(1-甲基-1H-四唑-5-硫甲基)-3-头孢烯-4-羧酸(7-AMCA)是合成甲氧头孢菌素关键中间体7β-氨基-7α-甲氧基-3-(1-甲基-1H-四唑-5-硫甲基)-3-头孢烯-4-羧酸二苯甲酯(7-MAC)的重要中间体。采用7-氨基头孢霉烷酸(7-ACA)和1-甲基-1H-1,2,3,4-四唑-5-硫醇(5-MMT)为原料,以乙酸为溶剂,甲磺酸为催化剂,经亲核取代制备得到7-AMCA。本文主要探讨了物料配比、催化剂用量、反应时间和温度等因素对反应的影响,并通过二次回归建立了数学模型,确定了合成7-AMCA的最佳工艺条件。在此基础上合成的产品收率高达93.24%,HPLC纯度98.76%。产品结构经^1H NMR和IR表征确认。 相似文献