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1.
刘钊杰  李志荣 《有机化学》1991,11(4):433-436
本文报道合成了25个具有不对称磷结构的O-烷基-O-芳基-N-烷基-N-[(二烷氨基羧基)甲基]硫代磷酰胺酯, 对它们的结构、性质和杀螨活性进行了初步研究。  相似文献   

2.
采用O-乙基-N-烷基(异硫氰基)硫代磷酰胺酯与不同胺的加成反应,合成了一系列新型的O-乙基-N-烷基(取代硫脲基)硫代磷酰胺酯,其结构经元素分析、IR及1HNMR证实.生物活性初步测定表明,这类化合物均具有一定的广谱杀菌及除草活性.  相似文献   

3.
徐光保 《有机化学》1996,16(1):72-77
本文报道了O-烷基-O-(2'-甲酰缩氨基硫脲苯基)-N-烷基硫代磷酰胺类化合物的合成方法, 化合物3c和3e具有良好的除草活性。  相似文献   

4.
本文报道了O-烷基-O-(2′-甲酰缩氨基硫脲苯基)-N-烷基硫代磷酰胺类化合物的合成方法,化合物3c和3e具有良好的除草活性。  相似文献   

5.
以D-丝氨酸为起始原料,经酯化、还原、氧化、缩合、水解等九步反应,合成了非天然氨基酸τ-L-His-D-Ala的关键前体——二肽物±(4S)-5-[(叔丁基二甲基硅氧)-4-(二苄氨基)-2-甲酰氨基-N-3-羟基-2-(三苯甲烷基)丙基]戊酰胺,总收率35.3%,其结构经1H NMR,13C NMR和MS表征。  相似文献   

6.
Unexpected dealkylation of Bischler-Napieralski cyclization of 2-(3,4-dimethoxy-2-nitro-phenyl)-N-[2-(3,4-dimethoxyphenyl) ethyl]-N-[(S)-1-phenyl-ethyl] acetamide 3 was reported.The electronic effect of the substituent at 2-position of C ring was also discussed.  相似文献   

7.
哒嗪酮的乙酰胺类化合物的合成及生物活性   总被引:2,自引:0,他引:2  
2-叔丁基-4-氯-5-羟基-哒嗪-3(2H)-酮(3)与相应的N-烷基或N,N-二烷基氯乙酰胺(4a-4l)反应,合成了2-叔丁基-5-[(N-烷基或N,N-二烷基乙酰胺)氧基]-4-氯-哒嗪-3(2H)-酮(1a-1l),生物活性测定结果表明部分化合物(1a-1l)具有杀虫活性。  相似文献   

8.
在研究O,O二烷基O芳基硫代磷酸酯(1)与三氯氧磷的异构化氯化反应机理时,发现1的异构化产物O,S二烷基硫代磷酸酯(4)能顺利地与三氯氧磷反应,4中的烷氧基被氯原子取代,得到的产物S烷基硫代磷酰氯酯(2)和O烷基磷酰二氯酯3.当4中的R为烷基或苯基,R'为烷氧基、芳氧基、烷硫基、芳硫基、二烷基氨基、氮杂环基、苯基和甲基,R"为C1-4烷基时,4的氯化反应也能顺利发生,并得到较高产率的预期产物.  相似文献   

9.
以川芎嗪为结构单元,与噻唑烷二酮类降糖药物的药效团组合,设计并合成了一个新的胰岛素增敏剂——2-甲氧基-5-[(2,4-二氧代-5-噻唑烷基)-甲基]-N-[(3,5,6-三甲基-2-吡嗪基)-甲基]-苯甲酰胺(Ⅰ),其结构经1H NMR和MS表征。体外活性测试结果表明,Ⅰ在用药量为1×10-5mol·L-1时对PPAR-γ的激动活性与吡格列酮相当;体内生物活性测试结果表明,Ⅰ有抑制血糖升高的倾向,有一定的血管内皮细胞保护作用。  相似文献   

10.
1986年Tacke将硅原子引进高效杀螨剂Torque——[(PhMe_2CCH_2)_3Sn]_2O,合成了具有同样生物活性的含硅类似物Silyl-Torque——[(PhMe_2SiCH_2)_3Sn]_2O.作者也曾报道三[(苯基二甲硅基)亚甲基]锡羧酸酯的合成,本文在此基础上合成了7个三[(苯基二甲硅  相似文献   

11.
用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.  相似文献   

12.
In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments.  相似文献   

13.
The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.  相似文献   

14.
KMnO4-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.  相似文献   

15.
The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.  相似文献   

16.
The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.  相似文献   

17.
Zhanhui Yang  Shiyi Yang  Jiaxi Xu 《Tetrahedron》2017,73(23):3240-3248
Regiospecific and direct imidation of the methyl C(sp3)–H bond of thioanisoles is realized under mild and metal-free conditions with N-fluorobis(benzenesulfonyl)imide as an oxidant and nitrogen source. Proposed mechanism suggests that thionium ion intermediates and a Pummerer-type reaction are involved. The imidation has advantages such as high step-economy, excellent functionality tolerance, and regiospecificity, giving structurally diverse imidation products.  相似文献   

18.
19.
《Tetrahedron》2014,70(21):3377-3384
The Rh(II)-catalyzed reaction of 2-carbonyl-substituted 2H-azirines with ethyl 2-cyano-2-diazoacetate or 2-diazo-3,3,3-trifluoropropionate provides an easy access to 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones. These compounds can be selectively prepared from the same starting material using temperature as the only varied parameter. The 2-azabuta-1,3-diene intermediate, a common precursor for both heterocyclic products, isomerizes into 2H-1,3-oxazine under kinetic control, while 1H-pyrrol-3(2H)-one is the sole product of the reaction at elevated temperatures. According to DFT-calculations a one-atom oxazine ring contraction involving ring-opening to a 2-azabuta-1,3-diene intermediate, followed by a 1,5- and 1,2-prototropic shift leads to the consecutive formation of imidoylketene and azomethine ylide, which then further undergo cyclization to the pyrrole derivative.  相似文献   

20.
把有限时间热力学理论用于化学过程的研究,将会得到一系列新的结论,开展这方面的研究是很有意义的.文献[1]以燃料电池为例,在同时考虑化学反应及传热不可逆性的情况下,研究了燃料电池的性能界限,文献[2]指出了文献[1]计算化学反应及传热不可逆性而引起系统与有关环境的总熵产生率的错误以及由此而导致的结论所存在的问题,并进行了富有启发性的分析与讨论.但文献[2]对于系统与有关环境的总熵产生率的计算也是不正确的,由此得到的其它结论自然不能成立.本文将就此情况下系统与有关环境的总熵产生率的计算再次进行讨论,并给出电池功率和效率的有限时间热力学性能界限.  相似文献   

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