含磷稠杂环的合成及其生物活性(Ⅵ)

在阳离子交换树脂D72存在下5-氨基-3-苄硫基-4-氰基(乙氧羰基)吡唑与苯基二氯化膦和芳醛的类Mannich反应,合成了9个2-苄硫基-3-氰基(乙氧羰基)-5-芳基-6-苯基-6-氧-6-磷杂-4,5,6-三氢咪唑[2,3e]吡唑,利用NMR方法确定其为反式构型,初步研究了反应机制。生物活性测试结果表明,部分化合物具有一定的除草活性。     

3-苄硫基-5-重氮基-4-乙氧羰基吡唑的合成、晶体结构的确定及反应活性的研究

吡唑类衍生物是一类具有很好生物活性的化合物,具有很高除草或杀虫活性的吡唑类化合物文献中已有大量的报导^[1]。因此研究其合成方法显得很重要。我们最初希望通过5-氨基-3-苄硫基-4-乙氧羰基吡唑经重氮化反应去氨基制备3-苄硫基-4-乙氧羰基吡唑,然后继续衍生化合成系列吡唑类化合物。     

含有4-溴卓酮结构单元的吡唑和异噁唑化合物的合成研究（英文）

本文通过4-(4-溴-7-(甲氨基)-2-卓酮基)-2,4-二羰基丁酸乙酯(6)和水合肼(5a)及盐酸羟胺(5b)的缩合-环化反应,首次合成了结构新颖的含有4-溴卓酮结构单元的吡唑和异噁唑化合物,即4-溴-2-(3-乙氧羰基-1H-5-吡唑基)-7-(甲氨基)卓酮(4a)和4-溴-2-(3-乙氧羰基5-异噁唑基)-7-(甲氨基)卓酮(4b)。这两种新合成的化合物可以为开发有用的药物活性先导化合物提供很好的底物。     

噻唑啉-2-硫酮衍生物的合成与生物活性

根据活性亚结构拼接原理,将3-芳基-4-氨基-5-乙氧羰基(氰基)-3H-噻唑啉-2-硫酮与酰氯反应得到目标化合物3-芳基-4-取代苯氧乙酰氨基-5-乙氧羰基(氰基)-3H-噻唑啉-2-硫酮.再以3-苯基-4-氨基-5-乙氧羰基-3H-噻唑啉-2-硫酮为合成原料,经过Aza-Wittig反应得到目标化合物5-芳氧基-3,6-二芳基-2-硫代噻唑并[4,5-d]嘧啶-7-酮.通过IR,1H NMR,EI-MS,元素分析等方法对所合成的化合物进行了结构表征.代表化合物5-对氯苯氧基-3,6-二苯基-2-硫代-2,3-二氢噻唑并[4,5-d]嘧啶-7(6H)-酮(C1)经单晶X衍射证实了结构.除草活性测试结果表明:部分噻唑啉-2-酮类衍生物对稗草和油菜都表现出了较好的抑制活性.     

3-甲基-4-乙氧羰基-5-取代肼基-1H-吡唑的合成

3-甲基-4-乙氧羰基-5-取代肼基-1H-吡唑的合成;甲基乙氧羰基取代肼基-1H-吡唑;合成;波谱分析     

微波辐射下合成2-甲硫基-3-氰基-7-取代苯基吡唑并[1,5-a]嘧啶及生物活性的研究

利用取代烯胺酮1与3-甲硫基-4-氰基-5-氨基-1H-吡唑(2)反应,用传统和微波2种方法合成了6种化合物2-甲硫基-3-氰基-7-取代苯基吡唑并[1,5-a]嘧啶(3a～3f),化合物的结构均经元素分析,IR,1H NMR所证实.对比两种方法,微波辐射具有用时少、环境友好、易纯化和产率高的特点,同时,探讨了反应可能的机理,并对所有化合物的杀菌和除草活性进行了测试.     

烯胺酮与氨基吡唑的反应：7-芳基-3-氰基-2-取代吡唑并[1,5-a]嘧啶的合成、结构及生物活性

利用3-取代-4-氰基-5-氨基-1H-吡唑分别与取代烯胺酮反应，合成了共12种新的2-取代-3-氰基-7-芳基吡唑并[1,5-a]嘧啶化合物。所有化合物的结构均经红外、核磁、元素分析进行表征。另外，利用X-单晶衍射对化合物4a的结构进一步加以确认。同时提出了反应可能的机理，并对部分化合物的除草活性进行了测试。     

N-[3-氰基-1-(2,6-二氯-4-三氟甲基苯基)-1H-吡唑-5-基]菊酰胺类化合物的合成及生物活性

为了寻求新的N-芳基吡唑类先导化合物, 用5种拟除虫菊酯类农药的活性基团——菊酸与高活性杀虫剂氟虫腈和其中间体5-氨基-3-氰基-1-(2,6-二氯-4-三氟甲基-苯基)吡唑在其氨基位置采用亚结构对接的方法合成得到了10个新的芳基吡唑菊酰胺类化合物. 经¹H NMR, ESI-MS和元素分析对化合物的结构进行了表征. 初步生物活性测定结果表明, 在37.5 mg/L浓度下, N-[3-氰基-1-(2,6-二氯-4-三氟甲基苯基)-4-(三氟甲基亚磺酰基)-1H-吡咯-5-基]-3-(2,2-二氯乙烯基)-2,2-二甲基环丙酰胺(3b)对小菜蛾Amaranthus spinosus抑制活性达到100%, LC₅₀为15.1 mg/L. 初步雌雄大鼠急性经口毒性综合评价属中毒级, 同时还检测了2-(4-氯苯基)-N-[3-氰基-1-(2,6-二氯-4-三氟甲基苯基)-1H-吡唑-5-基]-3-甲基丁酰胺(3i)的晶体结构.     

微波促进下6-氨基-4-芳基-5-氰基-3-甲基-1-苯基吡啶[2,3-c]并吡唑的合成

5-氨基-3-甲基-1-苯基吡唑与芳亚甲基丙二腈在少量乙二醇中, 经微波辐射得到6-氨基-4-芳基-5-氰基-3-甲基-1-苯基吡啶[2,3-c]并吡唑衍生物, 反应4～8 min完成, 产率为71%～90%, 产物结构通过红外、核磁共振、元素分析及单晶X射线分析表征.     

4-氨基-5-氰基-6-烷胺基吡啶衍生物的合成与生物活性

采用六水合硝酸锌作催化剂、少量的乙醇钠为助催化剂,使用无水乙醇作为溶剂,将2-氰基-3-烷胺基-3-氨基-丙烯腈(N,N-缩醛)与β-二羰基化合物一步关环生成了一系列目标化合物4-氨基-5-氰基-6-烷胺基吡啶衍生物.通过1H NMR,IR,EI-MS,元素分析等方法对所合成的化合物进行了结构表征.代表化合物2-甲基-4-氨基-5-氰基-6-乙醇胺基-3-乙氧羰基吡啶经单晶X衍射证实了结构.对合成的多取代吡啶衍生物化合物作了初步的农药活性测试,测试结果表明:所合成的多取代吡啶衍生物部分化合物表现出较好的杀菌活性,同时也对油菜和稗草具有一定的除草活性.     

Studies of the synthesis of heterocyclic compounds. Part VII. The preparation of some new 3- and 5-amino-pyrazoles by endocyclic N-substitution of 3(5)-aminopyrazoles

By reaction of some 4-carbethoxy(or cyano)-3(5)-R-5(3)-aminopyrazoles 1 with 2-nitrobenzoyl chloride or 2-nitrobenzenesulfonyl chloride, a number of novel 3- and 5-amino-1-(2-nitrobenzoyl or 2-nitrobenzene-sulfonyl)pyrazoles 6 and 7 were obtained. Every compound appearing during the endocyclic N-substitution process can be identified and determined by glc. The use of nmr offers a rapid, unambigous method for determining the proposed structures.     

Elucidation of the structures of 3-alkylthio-, 3-benzylthio-, 2-arylthio- and 2-heteroarylthio-N1-(1,3-dimethylbutyl)-N4-phenyl-1,4-phenylenediamines by one- and two-dimensional NMR spectroscopy

Nucleophilic addition of alkyl- and benzylthiols to benzoquinone diimine (1) gave the corresponding 3-alkylthio- or 3-benzylthio-1,4-phenylenediamines (2-5). However, addition of aryl- or heteroarylthiols to 1 formed 2-arylthio- or 2-heteroarylthio-1,4-phenylenediamines (6-14). The structures of 2-14, obtained in 55-91% yields, were confirmed in CDCl3 or DMSO-d6 solution using 1D (NOE difference, coupled 13C NMR spectra, APT and DEPT) and 2D NMR techniques [DQCOSY, NOESY, HETCOR and heteronuclear multiple bond coherence (HMBC)] that resulted in unambiguous proton and carbon NMR resonance assignments. The substituent-induced 13C NMR chemical shift differences were calculated in 2-14 relative to carbon atoms in the model compound N1-(1,3-dimethylbutyl)-N4-phenyl-1,4-phenylenediamine (DMBPPD) (15) (a reduced form of benzoquinone diimine).     

Stereoelectronic and inductive effects on 1H and 13C NMR chemical shifts of some cis-1,3-disubstituted cyclohexanes

This work presents the substituent effects on the 1H and 13C NMR chemical shifts in the cis-isomer of 3-Y-cyclohexanols (Y = Cl, Br, I, CH3, N(CH3)2 and OCH3) and 3-Y-1-methoxycyclohexanes (Y = F, Cl, Br, I, CH3, N(CH3)2 and OCH3). It was observed that the H-3 chemical shift, due to the substituent alpha-effect, increases with the increase of substituent electronegativity when Y is from the second row of the periodic table of elements, (CH3 *sigma(C3--H3a) interaction energy. This interaction energy, for the halogenated compounds, decreases with an increase in size of the halogen, and this is a possible reason for the largest measured chemical shift for H-3 of the iodo-derivatives. The beta-effect of the analyzed compounds showed that the chemical shift of hydrogens at C-2 and C-4 increases with the decrease of n(Y) --> *sigma(C2-C3) and n(Y) --> *sigma(C3-C4) interaction energies, respectively, showing a behavior similar to H-3. The alpha-effect on 13C chemical shifts correlates well with substituent electronegativity, while the beta-effect is inversely related to electronegativity in halogenated compounds. NBO analysis indicated that the substituent inductive effect is the predominant effect on 13C NMR chemical shift changes for the alpha-carbon. It was also observed that C-2 and C-4 chemical shifts for compounds with N(CH3)2, OCH3 and F are more shielded in comparison to the compounds having a halogen, most probably because of the larger interaction of the lone pair of more electronegative atoms (n(N) > n(O) > n(F)) with *sigma(C2-C3), *sigma(C3-C4) and *sigma(C3-H3a) in comparison with the same type of interaction with the lone pair of the other halogens.     

Synthesis and Antimicrobial Activity of 5-Aryl-6-[tetra(O-benzoyl)-β-<Emphasis Type="Italic">D</Emphasis>-glucopyranosylimino]-4-benzylthio-2-phenylimino-5,6-dihydro-2H-1,3,5-thiadiazines

Certain 5-aryl-6-[tetra(O-benzoyl)-β-D-glucopyranosylimino]-4-benzylthio-2-phenylimino-5,6-dihydro-2H-1,3,5-thiadiazines have been prepared by interaction of N-[tetra(O-benzoyl)-β-D-glucopyranosyl] isocyanodichloride and 1-aryl-5-phenyl-2-(S-benzyl)-2,4-isodithiobiurets. The products have been characterized through the usual chemical transformations, IR, NMR and mass spectral analyses. The compounds have been screened for their antibacterial activities against various bacteria. __________ Published in Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 910–913, June, 2005.     

Synthesis and NMR spectral studies of some 2,6-diarylpiperidin-4-one O-benzyloximes

Variously substituted 2,6-diarylpiperidin-4-one O-benzyloximes were synthesized by the direct condensation of the corresponding 2,6-diarylpiperidin-4-ones with O-benzylhydroxylamine hydrochloride. All the synthesized compounds are characterized by IR, Mass and NMR spectral studies. NMR spectral assignments are made unambiguously by their one-dimensional (1H NMR and 13C NMR) and two-dimensional (1H-1H COSY, NOESY, HSQC and HMBC) NMR spectra. All the synthesized compounds are resulted as single isomer, i.e., exclusively E isomer (9-14). The conformational preference of 2,6-diarylpiperidin-4-one oxime ethers with and without alkyl substituents at C-3 and C-5 has also been discussed using the spectral studies. The observed chemical shifts and coupling constants suggest that compounds 8-13 adopt normal chair conformation with equatorial orientation of all the substituents while compound 14 contributes significant boat conformation along with the predominant chair conformation in solution. The effect of oximination on ring carbons, their associated protons, alkyl substituents and ipso carbons are studied. Every proton in the piperidone ring of the oxime ether is observed as distinct signal due to oximination. The order of chemical shift magnitude in compound 8 is H-2a>H-6a>H-5e>H-3e>H-3a>H-5a. For 9-12, the order is H-6a>H-5e>H-2a>H-3a>H-5a, for 13, H-6a>H-2a>H-5e>H-3a>H-5a and for 14, the order is H-2a>H-6a>H-5e>H-3a>H-5a while the 13C chemical shift magnitude for 8-14 due to oximination is C-2>C-6>C-3>C-5.     

Synthese d'arylacetyl-3 carbethoxy ou acetyl-4 methyl-5 pyrazoles et de pyrazolo(3,4d)pyridazines : Action de l'hydrazine sur des carbethoxy ou acetyl-4 methyl-5 alkylidene-2 et n arylaminomethylene-2(2h)furannones-3

The reaction with hydrazine of 4-carbethoxy or acetyl 5-methyl(2H)furanones 2-substituted by arylmethine, alkenylmethine, arylaminomethine produces new 4,5-dihydro 3-methyl 4-oxo pyrazolo(3,4d)pyridazines or 3,4-dimethyl pyrazolo(3,4d)pyridazines. The preparation of 3-arylacetyl 4-carbethoxy or acetyl 5-methyl pyrazoles is described.     

1H and 13C NMR study of 5-substituted-4- (arylidene)amino-2,4-dihydro-3H-1,2,4-triazole-3-thiones and 6-aryl-3-(D-gluco- pentitol-1-yl)-7H-1,2,4-triazolo[3,4-b] [1,3,4]thiadiazines

Five 5-substituted-4-(arylidene)amino-2,4-dihydro-3H-1, 2,4-triazole-3-thiones (2a-2e) and seven 6-aryl-3-(D-gluco-pentitol-1-yl)-7H-1,2,4-triazolo[3,4-b][1,3,4]thiadiazines (3a-3g) were synthesized. The complete 1H and 13C NMR chemical shift assignments were analyzed on one- and two-dimensional NMR techniques, including DEPT, NOE-DIF, COSY, gHMBC, and gHSQC.     

Synthesis, Structure, and Some Properties of Substituted 3-Carbethoxy(methoxy)-5-cyano-1,2,3,4-tetrahydrospirocyclohexane-4-pyridine-2-thiones

The condensation of cyclohexylidenemalononitrile or cyclohexylidenecyanoacetic ester with thioamidoethyl(methyl)malonate in the presence of sodium ethylate gave 6-amino-3-carbethoxy-5-cyano-4-spirocyclohexane-1,2,3,4-tetrahydropyridine-2-thione and 3-carbethoxy(methoxy)-5-cyano-6-oxo-4-spirocyclohexanepiperidine-2-thiones which were used in the synthesis of the corresponding substituted 2-alkylthiotetrahydropyridines. 5-Carbethoxy-3-cyano-3-methyl-6-methylthio-4-spiro-cyclohexane-3,4-dihydropyridine-2(1H)-one was studied by X-ray crystallography.     

Regioselective addtion of 5-amino-3-benzylthio-1,2,4-triazole and its analogues with aryl isocyanates

The orientation of the addition of 5-amino-3-benzylthio-1,2,4-triazole and its analogues (pyrazole) (1) with the aryl isocyanate can be directed by controlling the reaction temperature and one of the product, 5-amino-1-arylaminocarbonyl-3-benzylthio-1,2,4-triazole (pyrazole) (2), can rearrange at 170°C to another product, 5-arylureylene-3-benzylthio-1,2,4-triazole (pyrazole) (3). A plausible mechanism explanation for this rearrangement reaction was presented. It was suggested that the rearrangement reaction could be referred to the thermodynamics transposition leading to the predominant 5-arylureylene-3-benzylthio-1,2,4-triazole energy preferentially.     

Toward the development of a structurally novel class of chiral auxiliaries. Conformational properties of the aldol adducts of oxadiazinones: observation of unusual shielding effects

Asymmetric aldol reactions were conducted with the titanium enolate of N(3)-hydrocinnamoyl-3,4,5,6-tetrahydro-2H-1,3,4-oxadiazin-2-one to afford aldol adducts 5a-j. The dominant product of the asymmetric aldol reaction was the non-Evans syn adduct as determined by (1)H NMR spectroscopy and X-ray crystallography. When evaluating the (1)H NMR spectra of adducts 5a-j, a highly shielded signal with an average chemical shift of 0.05 ppm was observed. This signal was readily determined to be the C(5)-methyl group of the oxadiazinone. It is presumed that the overall conformation adopted by the aldol adducts in solution places an aromatic ring of the N(3)-substituent in close proximity to the C(5)-methyl group. An investigation of this conformational preference is conducted employing (1)H NMR spectroscopy, X-ray crystallography, and computational methods.