共查询到20条相似文献,搜索用时 531 毫秒
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1-苄氧羰基-3-叔丁氧羰酰氨基氮杂环丁烷的合成工艺改进 总被引:1,自引:0,他引:1
以苄胺和环氧氯丙烷为原料,经开环、关环、取代、还原、脱苄等反应合成了1-苄氧羰基-3-叔丁氧羰酰氨基氮杂环丁烷,总收率22.9%.其结构经1H NMR,13C NMR和MS表征. 相似文献
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呋喃酚经醚化、傅克酰化、α-溴代、噻唑环化和亚胺化等反应合成了16种4-(7-甲氧基-2,2-二甲基-2,3-二氢苯并呋喃-5-基)-2-苄亚氨基噻唑新化合物.化合物的结构经1H NMR、质谱和元素分析等确证.杀虫活性实验结果表明,化合物2a和2i在500 mg/L对棉红蜘蛛死亡率分别为53.10%和67.71%,杀菌活性实验结果表明,化合物2a和2k在25 mg/L对油菜菌核病菌抑制率分别为57.9%和59.8%,除草活性实验结果表明,2l在2250 g.ai/ha浓度下对苘麻、刺苋、藜具有一定的除草活性. 相似文献
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四种天然槲皮素-3-糖苷的合成 总被引:1,自引:0,他引:1
以芦丁为原料, 经苄基化、酸水解得到关键中间体3′,4′,7-O-三苄基槲皮素(3), 3与相应的1-溴代乙酰糖在四丁基溴化铵催化下在氯仿-0.25 mol•L-1 K2CO3溶液中缩合成相应的糖苷, 脱去保护基得天然槲皮素3-糖苷类化合物 1a~1d. 其结构经IR, 1H NMR, MS及元素分析确证. 相似文献
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YING Hua-Zhou SUN Mao-Tang LIU Tao HU Yong-Zhou① 《结构化学》2008,27(10):1171-1174
The title compound 2-(2-chloro-4-nitrophenyl)-4-(4-chlorophenyl)-3a,4- diethoxy- 2,3,3a, 4-tetrahydrochromeno[3,4-d][1,2,3]diazaphosphole 2 (C29H30Cl2N3O7P, Mr = 633.44) was synthesized and its structure was characterized by IR, MS, ^1H NMR, ^13C NMR, ^31p NMR, elemental analysis and single-crystal X-ray diffraction. It crystallizes in triclinic, space group P1^-, a = 9.1549(3), b = 10.7168(4), c = 17.6272(6)A, α = 102.9363(12), β = 90.2713(9), γ = 117.4265(10)°, V= 1484.41(9)A^3, Z= 2,μ(MoKa) = 0.323, F(000) = 658, Z= 2, De= 1.417 g/cm^3, the final R = 0.0687 and wR = 0.2066 for 4943 observed reflections (I 〉 2σ(I)). X-ray analysis reveals that the diazaphospholine ring is almost planar and the two ethoxy groups bonded on the 3a- and 4-positions are in trans configurations. Its antiproliferative activity was also tested in vitro against four human tumor cell lines. 相似文献
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The 13C NMR spectra of twelve 3-aryl-4-(5-aryl-Δ2-l,2,4-oxadiazolin-3-yl)sydnones and twelve 3-aryl-4-(5-aryl-l,2,4-oxadiazol-3-yl)sydnones have been measured and assigned by means of proton-noise decoupling and DEPT-experiments. The coupling constants were determined by means of gated decoupling, and NOE effects were observed by comparison of proton-decoupled and inverse-gated decoupled spectra. Differences shown by the oxadiazoline and the oxadiazole rings and the substitution effects are discussed. 相似文献
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An efficient synthetic method for the preparation of (E)- and (Z)-3(5)-(2-hydroxyphenyl)-4-styrylpyrazoles has been developed. The reaction of (E)- and (Z)-3-styrylchromones with hydrazine hydrate afforded the corresponding (E)- and (Z)-4-styrylpyrazoles, respectively, saved 4′-nitro-derivatives where both (E)- and (Z)-4′-nitro-3-styrylchromones afforded (E)-3(5)-(2-hydroxyphenyl)-4-(4-nitrostyryl)pyrazoles. The reaction mechanism for these transformations was discussed and the stereochemistry of all products was assigned by NMR experiments. 相似文献
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Rahhal El Ajlaoui Amiri Ouafa Souad Mojahidi Lahcen El Ammari Mohamed Saadi 《合成通讯》2013,43(17):2035-2042
AbstractThe reaction of 3-allylrhodanine with 2-arylidene-4-methyl-5-oxopyrazolidinium ylides proceeded unexpectedly to form novel 3-allyl-5-(arylidene)-2-thioxo-thiazolidin-4-ones 6a–k in good yields. All structures have been formulated on the basis of their spectral (IR, NMR, MS) data and elemental analyses. In addition, the structure of compound 6a was confirmed by means of x-ray crystallographic analysis. 相似文献
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1-脱氢松香酰基-3-取代硫脲以及5-(脱羧脱氢松香-4-基)-3-芳氨基- 1H-1,2,4-三唑化合物的合成与生物活性 总被引:2,自引:0,他引:2
以广西的优势资源松香为原料, 脱氢松香酸与亚硫酰氯、硫氰化钾分别在回流条件下反应6 h和1.5 h, 得到脱氢松香酰异硫氰酸酯, 产率52%; 然后与胺在加热回流条件下反应1.5 h, 得到11种1-脱氢松香酰基-3-取代硫脲4, 产率63%~94%; 4a~4f 分别与水合肼在搅拌下回流反应3~6 h, 得到6种5-(脱羧脱氢松香-4-基)-3-芳氨基-1H-1,2,4-三唑化合物5, 产率70%~94%; 所有化合物的结构均经IR, 1H NMR, 13C NMR和元素分析确认. 初步生物活性测试表明, 4e, 4f, 4j, 5b对枯草杆菌抑菌率较高, 特别是4j在浓度为50 mg/L时就达到较好效果; 4b, 4h, 4i, 5e在100 mg/L时对大肠杆菌的抑菌效果较好. 相似文献
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以3-硝基-2-氨基苯甲酸甲酯为原料,经三氟乙酰化、N-烷基化和脱保护反应制得坎地沙坦中间体2-{[(2'-氰基联苯基-4-基)甲基]氨基}-3-硝基苯甲酸甲酯,其结构经~1H NMR,~(13)C NMR和MS(ESI)确证。 相似文献
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研究了一条新的路线用于他汀类药物的重要中间体(R)-4-氰基-3-羟基丁酸乙酯的合成. 以廉价、易得的L-(-)-苹果酸为起始原料, 经酯化、还原、溴代和氰化四步反应得到目标化合物(R)-4-氰基-3-羟基丁酸乙酯, 合成总收率为56.7%. 所有中间体和最终产物均由ESI-MS, 1H NMR和13C NMR光谱及比旋光度表征并与文献值比较. 该方法原料易得、操作简便、收率良好, 产物容易分离纯化, 是一条适合大规模制备(R)-4-氰基-3-羟基丁酸乙酯的新合成工艺路线. 相似文献