Synthesis and Antifungal Activities of Novel Strobilurin Derivatives Containing Quinolin-2(1H)-one Moiety

To discover novel lead compounds with better antifungal activities, a series of novel strobilurin derivatives containing quinolin-2(1H)-one moiety was designed and synthesized via intermediate derivatization method. Their structures were characterized by means of ¹H nuclear magnetic resonance(¹H NMR), ¹³C NMR and high resolution mass spectrometry(HRMS). The biological assay results indicate that most target compounds exhibit good to excellent fungicidal activities against 10 plant pathogens. Compounds 4d, 5b and 5c possess 94.1%, 83.8% and 80.9% in vitro inhibition respectively against Rhizotonia cereals at the concentration of 50 μg/mL, which are better than that of the control agents. Especially, the inhibition activities of compound 4d against all of the tested fungi approach or exceed those of the controls. The structure-activity relationship was also discussed.     

环己基(三甲基硅基亚甲基)锡二芳香酸酯的合成、结构和抗癌活性

采用环己基(三甲基硅基亚甲基)二氯化锡和芳香酸(物质的量比1:2)在三乙胺存在下,合成了8种新的混合二烃基锡化合物环己基(三甲基硅基亚甲基)锡二芳香酸酯。 通过IR、¹H NMR、¹³C NMR和元素分析等技术手段对它们的结构进行了表征;部分化合物的生物活性测定初步结果表明,它们对肺腺癌细胞(A549)有较好的体外抗癌活性,抑制率均在75%以上。     

Synthesis and Biological Evaluation of Novel Saccharin Derivatives Containing 1,2,3-Triazole Moiety

A series of novel saccharin derivatives containing 1,2,3-triazole moiety was synthesized in satisfactory yields. The structures of all the compounds were elucidated and confirmed by Fourier transform infrared(FTIR) spectroscopy, ¹H and ¹³C nuclear magnetic resonance(¹H NMR, ¹³C NMR) spectroscopy, and high resolution mass spectrometry(HRMS). The bioassays indicated that most of the title compounds displayed some extent herbicidal activities at 100 μg/mL.     

Synthesis and insecticidal activities of novel bridged-neonicotinoids

A series of novel bridged-neonicotinoid analogues were designed and synthesized, which were constructed by starting material 8 with cyclopentenone or cyclohexenone in the presence of catalyst aluminium chloride. All of the compounds were characterized and confirmed by ¹H NMR, ¹³C NMR, HRMS and IR. The bioassay tests showed that compounds 5 and 6a showed higher bioactivities than imidacloprid against Aphis craccivora.     

新型丙烯海松酸基双噻二唑化合物的合成及其抗真菌活性

松香与丙烯酸经Diels-Alder环加成反应制得丙烯海松酸(1); 将1转化为双酰氯后与2-氨基-5-取代苯基-1,3,4-噻二唑经-N-酰化反应合成了8个新型的丙烯海松酸基双噻二唑化合物(4a~4h),其结构经¹H NMR, ¹³C NMR, IR和元素分析表征。抗真菌活性测试结果表明,在用药量为50 μg·mL^-1时,4d(R=m-Cl)对苹果轮纹病菌、花生褐斑病菌和小麦赤霉病菌的抑制率分别为66.9%, 57.8%和52.9%。     

α－酰氨基环十二酮的合成及其结构表征

以易得的环十二酮为原料,制得中间体α-硝基环十二酮后,选择性还原为α-氨基环十二酮(Ⅱ),再经氨基的酰化,共合成12种目标化合物(Ⅲ).它们的结构用IR,MS,¹H NMR和元素分析进行了表征。初步的生物测定表明,它们中的一些对稗草和油菜显示出良好的除草活性。在合成Ⅱ的过程中,分离到一种结晶化合物,经波谱测定和元素分析确定其结构为双[邻-1,10-亚癸基]吡嗪(Ⅳ),并得到合成的验证。     

2,5-二酮哌嗪衍生物的一锅法合成及其细胞毒活性

以DMF为溶剂,Cs₂CO₃为碱, N,N-二乙酰基-2,5-二酮哌嗪,芳醛和卤代烷经一锅法合成了１10个2,5-二酮哌嗪类衍生物（4a~4j,其中4c, 4f和4i为新化合物）,收率54.2％～75.7％,其结构经¹H NMR, ¹³C NMR和ESI-MS确证。生物活性研究结果表明：（Z）-1-乙酰基-3-（1-亚甲基萘）-4-烯丙基-2,5-二酮哌嗪（4c）对U937, Hela和Du145等细胞具有一定的细胞毒活性。     

NMR Study of Pore Surface and Size in a Mesoporous Material FSM-16

Surface structure, pore size distribution and pore wall thickness of a mesoporous material FSM-16 have been studied by X-ray powder diffraction (XRD), ^lH and ²⁹Si MAS NMR and ¹H liquid-state NMR, and by applying surface silylation as a probe. Concentrations of surface hydroxyl groups for FSM-16 are estimated from ²⁹Si and ¹H MAS NMR, which are about 3×l0²¹ g^-1, corresponding to approximately 3 nm^-2. O₂ molecules contribute to ²⁹Si spin-lattice relaxation of Q² and Q³ as well as Q⁴, suggesting thin wall thickness. ¹H MAS NMR spectra indicate the presence of isolated and hydrogen-bonded hydroxyl groups. Both hydroxyl groups are silylated, where the silylated fraction is about 50%. The spatial distribution of surface hydroxyl groups is estimated from the line width in ¹H static spectra. A rather homogeneous distribution is demonstrated in one of the samples. The sample with less homogeneous distribution has a larger affinity for moisture. Pore size and pore wall thickness were determined by ¹H NMR measurements on water saturated FSM-16 samples, which are in good agreement with literature values obtained by N₂ adsorption isotherms and transmission electron micrographs on a similar sample. In benzene saturated samples, a non-freezing surface layer of benzene is much thicker than that of water, which indicates a stronger interaction between benzene and the FSM-16 surface.     

烟酰胺腺嘌呤二核苷酸(NAD~+)类似物的合成及性质

合成了3种新型结构稳定的烟酰胺腺嘌呤二核苷酸(NAD~+)类似物并通过~1H NMR、~(13)C NMR、~(31)P NMR和HRMS进行了表征。NAD~+类似物经80℃加热24 h后,通过~1H NMR确认其结构稳定;通过循环伏安法(CV)测定了其电化学性质,表明其仍然具有良好的氧化还原性能。     

混合三烃基锡衍生物的研究(Ⅲ)──二丁基一环己基锡羧酸酯的合成、结构表征及生物活性

以丁基替换环己基,合成了20种二丁基一环己基锡羧酸酯。利用IR、NMR及元素分析表征了化合物的结构,确定了化合物的质谱裂解机制。对化合物进行了生物活性普筛试验。结果表明,这类化合物同时具有高效杀菌和杀螨活性。     

混合三烃基锡衍生物的研究(Ⅱ)─一丁基二环己基锡羧酸酯的合成、结构表征及生物活性

合成了21个混合三烃基锡羧酸酯。利用红外光谱、核磁共振谱(¹H,¹³C,¹¹⁹Sn)和质谱表征了化合物的结构。对取代苯甲酸酯化合物,锡原子的化学位移δ(¹¹⁹Sn)与苯环上取代基的Hammett常数有很好的线性关系。化合物的生物活性测定结果表明,它们具有高效杀螨活性。     

汉防己甲素衍生物的合成及其生物活性

为寻找更为有效的抗肿瘤药物,改善汉防己甲素的抗肿瘤活性,本文以汉防己甲素为原料,经过Suzuki反应设计并合成了6个新的双苄基异喹啉类衍生物。新化合物经过质谱(MS)、核磁共振氢谱(~1H NMR)、核磁共振碳谱(~(13)C NMR)等技术手段进行了结构确证。采用细胞计数试剂盒(CCK-8)法初步评价了6个新化合物对人肺癌细胞(A549)和小鼠白血病细胞(P388)的抗肿瘤活性。结果表明,化合物均有不同程度的抗肿瘤活性,其中化合物H1、H4、H6对A549细胞的抗肿瘤活性(IC5010μmol/L)明显优于阳性对照汉防己甲素。     

Synthesis and biological activities of(E)-β-farnesene analogues containing 1,2,3-thiadiazole

In order to discover novel compounds with high-activity to control aphid,a series of novel(E)-β-farnesene analogues containing 1,2,3-thiadiazole were designed and synthesized,and their structures were confirmed by IR,~1H NMR,~(13)C NMR,and HRMS(ESI).The stability of representative compounds was studied by HPLC and ~1H NMR techniques.Repellent activity results indicated that compounds 8h and 8j displayed 60.3%and 62.0%repellent rates,respectively.The aphicidal bioassay results showed that most analogues exhibited considerable aphicidal activity against Myzus persicae.Especially,analogues 81,8s and 8t exhibited high activity with LC_(50) values of 33.4 μg/mL,50.2 μg/mL and 61.8 μg/mL,respectively,which were higher than the lead compound(E)-β-farnesene,but lower than commercial insecticide pymetrozine with a LC_(50) of 7.1 μg/mL     

Design,Synthesis and Insecticidal Activities of Novel Phenyl Substituted Isoxazolecarboxamides

Thirteen novel phenyl substituted isoxazolecarboxamides were synthesized, and their structures were characterized by ¹H NMR, elementary analysis and high-resolution mass spectrometry(HRMS) techniques. Their evaluated insecticidal activities against oriental armyworm(Mythimna separata) indicate that the phenyl substituted isoxazolecarboxamides exhibited moderate insecticidal activities, among which compounds 9c and 9k showed comparatively higher activities.     

六氢-1H-吡咯并[3,4-d]嘧啶衍生物的合成及抗肿瘤活性

以顺丁烯二酸酐为原料,经过水解、缩合、库尔提斯重排、脱保护得到1-苄基-3-氨基-吡咯烷-4-羧酸甲酯盐酸盐,再与硫脲衍生物缩合得到1-苄基-4-(2-甲酸叔丁酯-3-胍基)吡咯烷-3-羧酸甲酯衍生物,最后经过水解、酯化、脱保护得到六氢-1H-吡咯并[3,4-d]嘧啶衍生物,其结构经~1H NMR、~(13)C NMR、ESI-MS和元素分析表征。3-(4,5-二甲基噻唑-2)-2,5-二苯基四氮唑溴盐(MTT)法测试其抗肿瘤活性,实验结果表明,其中化合物9d和9g对肿瘤细胞(Bel-7402)株具有明显的抑制活性。     

Microstructure determination of N-vinyl-2-pyrrolidone/butyl acrylate copolymers by NMR spectroscopy

The copolymer composition of N-vinyl-2-pyrrolidone/butyl acrylate (V/B) copolymers was determined from the quantitative ¹³C{¹H} NMR spectra. The monomer reactivity ratios for N-vinyl-2-pyrrolidone (V) and butyl acrylate (B) were found to be r_V=0.11±0.07, r_B=0.54±0.19, using the Kelen–Tudos and non-linear least-square error-in-variable (EVM) methods. The ¹³C{¹H} and ¹H NMR spectra of these copolymers are overlapping and complex. The complete spectral assignment of the carbon and proton NMR spectra were done by employing distortionless enhancement by polarization transfer (DEPT) and two-dimensional (2D) ¹³C–¹H heteronuclear single quantum correlation spectroscopy experiments. The 2D total correlation spectroscopy (TOCSY) (¹H–¹H homonuclear TOCSY) NMR spectrum was used to ascertain the various geminal and vicinal couplings in the copolymer.     

新型瑞香酮类似物的合成及杀菌活性

以瑞香狼毒中分离的天然产物(E)-1,5-二苯基-2-烯-1-戊酮(A)为先导, 引入色酮片段设计合成了15个新型的瑞香酮类似物, 其结构均经IR, ¹H NMR, ¹³C NMR及元素分析或HRMS确证. 杀菌活性测试结果表明, 在100 mg/mL浓度下, 部分化合物的杀菌活性优于先导化合物A, 其中化合物6d对水稻纹枯病菌和黄瓜灰霉病菌的抑制率分别为87%和86%, 与对照药剂苯醚甲环唑相当, 值得进一步优化研究.     

C and H nuclear magnetic shielding and spin–spin coupling constants of C-enriched bromomethane in the gas phase

¹³C and ¹H NMR spectral parameters are investigated for ¹³CH₃Br in gaseous matrices. It is found that both the ¹³C and ¹H chemical shifts of ¹³CH₃Br are linearly dependent on solvent density. Similar dependence is also detected for one-bond spin–spin coupling, ¹J(CH). For the first time the ¹³C and ¹H magnetic shielding constants and ¹J(CH) spin–spin coupling are obtained for an isolated ¹³CH₃Br molecule together with the coefficients responsible for solute–solvent molecular interactions in gaseous matrices. The present experimental results confirm the accuracy of some recent ab initio calculations of nuclear magnetic shielding performed for bromomethane.     

Synthetic derivatives of spiromesifen and their bioactivity research

Sixteen new derivatives of spiromesifen were synthesized from 3-(2,4,6-trimethylphenyl)-4-hydroxy-△~3-dihydrofuran-2-one. Their bioactivities against diamondbackmoth(Plutella xybstella) and spider mites(Tetranychus cinnabarinus) were also evaluated. The structures of these derivatives were confirmed by ~1H NMR,MS.     

H, C NMR spectral and single crystal structural studies of toxaphene congeners. Quantum chemical calculations for preferred conformers of 2,5-endo,6-exo,8,9,9,10,10-octachloro-2-bornene and their DFT/GIAO C chemical shifts

The ¹H and ¹³C NMR chemical shifts for six toxaphene congeners: 2-exo,3-endo,6-exo,8,9,10-hexachloro- (1), 2-exo,3-endo,5-exo,9,9,10,10-heptachloro- (2), 2-exo,3-endo,6-exo,8,9,10,10-heptachloro- (3), 2-exo,3-endo,5-exo,6-endo,8,9,10-heptachloro- (4), 2-exo,3-endo,5-exo,6-endo,8,9,9,10-octachlorobornane (5) and 2,5-endo,6-exo,8,9,9,10,10-octachloro-2-bornene (6) are reported. Their chemical shift assignments have been obtained by means of Pulsed Field Gradient (PFG) Double Quantum Filtered (DQF) ¹H,¹H correlation spectroscopy (COSY), PFG ¹H,¹³C Heteronuclear Multiple Quantum Coherence (HMQC) and PFG ¹H,¹³C Heteronuclear Multiple Bond Correlation (HMBC) experiments. A single crystal X-ray structural analysis was made for compounds 1, 3, 4 and 6. The prevalences of two octachlorobornene rotamers (6a,6b) were elucidated by ab initio MO method and single point DFT/GIAO calculations for ¹³C chemical shifts. Theoretical calculations proved that the single crystal structure of 6 corresponds its most stable conformer in solution.