微波辐射下硅磺酸催化的香豆素并[4,3-d]吡唑并[3,4-b]吡啶的高效合成

在硅磺酸催化下,通过微波辐射的3-酰基香豆素与5-氨基吡唑的反应,一步高产率地合成了一系列香豆素并[4,3-d]吡唑并[3,4-b]吡啶衍生物.该方法具有反应时间短(20~30 min)、选择性好、产率高、操作简单和环境友好等优点.产物的结构经红外光谱、核磁共振谱及高分辨质谱予以确定.     

色烯并[4,3-d]吡唑并[3,4-b]吡啶衍生物的三组分合成及荧光性质研究

在三乙胺催化下,利用取代水杨醛、氰乙酸酯和5-氨基吡唑的三组分反应合成了一系列5-氨基色烯并[4,3-d]吡唑并[3,4-b]吡啶-6(3H)-酮衍生物4a～4v.荧光研究表明部分合成得到的化合物具有高的荧光量子产率.     

1-甲基-3-苯基-5-对甲苯基-6,7,8,9,10,11,12,13,14,15-十氢-3H-环十二烷[d]吡唑并[3,4-b]吡啶的微波合成和结构表征

标题化合物(C30H35N3)以4-甲基苯甲醛、环十二酮和3-甲基-1-苯基-1 H-吡唑-5-胺,在三氟乙酸和醋酸的作用下,经微波辐射合成得到.其结构通过单晶X射线衍射法确定,晶体属单斜晶系,空间群P21/c,相对分子质量Mr=437.61,晶胞参数a=1.089 26(11)nm,b=2.192 7(2)nm,c=1.049 54(14)nm,V=2.464 1(5)nm3,Z=4,晶胞密度Dc=1.180g/m3,吸收系数μ=0.069mm-1,单胞中电子的数目F(000)=944.晶体结构用直接法解出,经全矩阵最小二乘法对原子参数进行修正,最终的偏离因子为R=0.046 8,ωR=0.090 5.在晶体结构中新形成的吡啶环为共平面结构.     

有机催化不对称[3+3]环化合成新型光学活性稠合多环3,4-二氢吡喃并[4,3-b]吡喃-5-(2H)-酮（英文）

发展了一种手性双功能方酰胺催化的4-羟基-2(H)-吡喃并[2',3':4,5]吡喃并[2,3-c]吡唑-2,5(7H)-二酮与(E)-2-硝基烯丙基醋酸酯之间的对映选择[3+3]环化反应,为立体选择构筑稠合多环3,4-二氢吡喃并[4,3-b]吡喃-5-(2H)-酮骨架提供了途径.在衍生自(1R,2R)-1,2-二苯基乙-1,2-二胺的手性双功能方酰胺的催化下,以中等至较高产率、高的反式选择性和中等至优秀的对映选择性得到了一系列具有两个连续手性中心的新型稠合多环3,4-二氢吡喃并[4,3-b]吡喃-5-(2H)-酮衍生物.     

新型4-芳氧基吡啶并[3′,2′∶4,5]噻吩并[3,2-d]嘧啶衍生物的合成

2-氯-3-氰基吡啶与巯基乙酸乙酯经闭环反应制得3-氨基吡啶并[3,′2′∶4,5]噻吩-2-甲酸乙酯(1);1与甲酰胺第二次成环生成吡啶并[3,′2′∶4,5]噻吩并[3,2-d]嘧啶-4-酮(2);2经氯化后与取代苯酚反应合成了12个新型的4-芳氧基吡啶并[3,′2′∶4,5]噻吩并[3,2-d]嘧啶衍生物,其结构经1H NMR,13C NMR,IR和元素分析表征。     

新型5-芳甲酰胺基-6-芳胺基-吡唑并[3,4-d] 嘧啶-4-酮衍生物的合成及其除草活性

以吡唑膦亚胺、芳基异氰酸酯和芳基甲酰肼为原料，通过串联氮杂Wittig反应关环合成了12种新型的5-芳甲酰胺基-6-芳胺基-吡唑并[3,4-d]嘧啶-4-酮衍生物(3a~3l)，其结构经¹H NMR, ¹³C NMR， IR和HR-MS(ESI)表征。对单双子叶除草活性的初步测试结果发现：部分化合物具有优异的除草活性，特别是浓度为100 mg·L^-1时，5-(4-氟苯甲酰胺基)-6-(4-氯苯胺基)-3-甲硫基-1-苯基-1H-吡唑[3,4-d]-嘧啶-4(5H)-酮3i和5-(4-吡啶苯甲酰胺基)-6-(4-氯苯胺基)-3-甲硫基-1-苯基-1H-吡唑[3,4-d]-嘧啶-4 (5H)-酮3k对油菜和稗草的茎和根的抑制率高达100%。     

新型含氮磷杂并环化合物-吡唑并[3,4-d]-1,3,2-二氮磷杂六环-6-酮衍生物的合成研究

本文以异嘌呤类杂环-吡唑并[3,4-d]嘧啶为先导,以1-取代-5-取代氨基-4-(N-烷基)吡唑甲酰胺及取代苯基二氯化膦、六乙基亚磷三酰胺为原料,设计并合成42个新型含氮磷杂并环化合物-吡唑并[3,4-d]-1,3,2-二氮磷杂六环-6-酮衍生物.经1H NMR、IR、MS及元素分析确定了它们的化学结构.初步测定了它们的生物活性.实验表明这些化合物具有一定的抗癌活性及农药活性.     

5-氨基-6-硝基-[1,2,5]噁二唑并[3,4-b]吡啶-1-氧化物的合成新方法

以2,6-二氯吡啶为起始原料, 经肼基化、还原、硝化、Nietzki-Dietschy环合4步反应得到5-氨基-6-硝基-[1,2,5]噁二唑并[3,4-b]吡啶-1-氧化物。 结合反应机理讨论了还原、硝化、Nietzki-Dietschy环合反应的影响因素,获得了合成5-氨基-6-硝基-[1,2,5]噁二唑并[3,4-b]吡啶-1-氧化物的最佳工艺条件,目标产物的总收率为59.2%。 用1H NMR、MS和IR谱对5-氨基-6-硝基-[1,2,5]噁二唑并[3,4-b]吡啶-1-氧化物的结构进行了表征。     

含吡唑1,2,4-三唑噻二嗪衍生物的合成及抑菌活性

1-苯基-3-甲基-5-氯-4-吡唑甲醛与4-氨基-5-取代苯基-1,2,4-三唑-3-硫酮缩合生成4-(1-苯基-3-甲基-5-氯吡唑次甲亚胺基)-5-(取代苯基)-2H-1,2,4-三唑-3(4H)-硫酮,再烷基加成化为新型含吡唑基5,6-2H-1,2,4-三唑[3,4-b][1,3,4]噻二嗪衍生物。 化合物结构经¹H NMR、IR以及元素分析确认。 初步生物活性测试结果表明,在100 mg/L浓度下,化合物8a(3-(2-甲基苯基)-6-(5-氯-2-甲基-4-苯基吡唑)-7-(4-硝基苯基)-5H-1,2,4-三唑[3,4-b][1,3,4]噻二嗪)对黄瓜炭疽病的抑制率达90%。     

5-氨基-6-硝基-[1,2,5]噁二唑并[3,4-b]吡啶-1-氧化物的新法合成

以2,6-二氯吡啶为起始原料,经肼基化、还原、硝化、Nietzki-Dietschy环合4步反应得到5-氨基-6-硝基-[1,2,5]噁二唑并[3,4-b]吡啶-1-氧化物.结合反应机理讨论了还原、硝化、Nietzki-Dietschy环合反应的影响因素,获得了合成-.氨基-6-硝基-[1,2,5]噁二唑并[3,4-b]吡啶-1-氧化物的最佳工艺条件,目标产物的总收率为59.2%.用1H NMR、MS和IR谱对5-氨基-6-硝基-[1,2,5]噁二唑并[3,4-b]吡啶-1-氧化物的结构进行了表征.     

Synthesis and Crystal Structure of 8-(2,3-Dimethoxyphenyl)-10,11,12,13-tetrahydro-9H-benzo [f] cyclohepta [c] quinoline

The title compound 8-(2,3-dimethoxyphenyl)-10,11,12,13-tetrahydro-9H-benzo[f]-cyclohepta[c]quinoline(C26H25NO2,Mr=383.47) was synthesized and characterized by IR,1H NMR,13C NMR and elemental analysis.The crystal belongs to triclinic,space group P1 with a= 8.1490(16),b=9.2550(19),c=14.373(3) ,α=86.96(3),β=89.66(3),γ=70.32(3)°,Z=2,V=1019.2(4) 3,Dc=1.250 g·cm-3,μ(MoKα)=0.078 mm-1,F(000)=408,the final R=0.0555 and wR=0.1240 for 2228 observed reflections(Ⅰ > 2σ(Ⅰ)).X-ray analysis reveals that the seven-numbered ring is slightly similar to a six-numbered ring,forming the chair-like conformation.The four rings(Ⅰ,Ⅱ,Ⅲ and Ⅳ) in the benzo[f]cyclohepta[c]quinoline moiety form a screw structure.     

2-[4-(2-Thienyl)-1,3-thiazol-2-yl]ethanenitrile in Heterocyclic Synthesis of Biological Interist

Abstract

Thiazolylacetonitrile was used in the synthesis of coumarin, pyrazolo[4,3]pyrimidines, 1,3,4-thiadiazolines, aminothiophenes, and thiazoles in a good yields. Also, pyrazolo[4,5-d]triazolino[4,5-a]pyrimidines, pyrazolo[4,5-d]thiazolino[3,2-a]pyrimidines, and pyrazolo[4,5-d]tetrazolino[1,5-a]pyrimidines were synthesized from pyrazolo[4,5-d]pyrimidine. Structures of the newly synthesized were elucidated by elemental analysis, spectral data, and alternative synthesis routes whenever possible. Some synthesized compounds were tested for their antimicrobial activity.     

Spectrophotometric study of the supramolecular complexes of [60]- and [70]Fullerenes with biscalix[6]arene and crown[4]calix[6]arene

[60]- and [70]Fullerenes have been shown to form 1:1 supramolecular complexes with bis[2-(5,11,17,23,29,35-hexa-tert-butyl-37,38,39,40,41-pentahydroxycalix[6]arenyl-oxy ethyl ether) (1) and 5,11,17,23,29,35-hexa-tert-butyl-37,38,40,41-tetra hydroxyl-39,42-(crown-4)calix[6]arene (2) in CHCl3 medium by electronic absorption spectroscopy. Formation constants (K) of the complexes of [60]- and [70]fullerenes with 1 and 2 have been determined at room temperature from which free energy of formation values of the complexes have been estimated. The very high formation constant value of [60]fullerene/1 complex (5900 dm3 mol-1) in indicative of formation of inclusion complex. Moreover, PM3 calculations reveal that intermolecular interaction between [60]fullerene and 1 proceeds through quite deep energy molecular orbital.     

Synthesis and positive inotropic evaluation of 1-(benzylamino)-3-(4,5-di-hydro[1,2,4]trizaolo[4,3-a]quinolin-7-yloxy)propan-2-ol derivatives

In an attempt to search for more potent positive inotropic agents,a series of 1-(benzylamino)-3-(4,5-dihydro[1,2,4]trizaolo[4,3- a]quinolin-7-yloxy)propan-2-ol derivatives was synthesized in four steps using 6-hydroxy-3,4-dihydro-2(1H)-quinolinone as a starting material,and their positive inotropic activities were evaluated by measuring the coronary blood flow(CBF)and the left ventricular pressure(LVP)followed by calculating the rate of pressure development(dp/dt_(max)values)in the preparation of rat Lan...     

Synthesis of spiro[4.5]decane and bicyclo[4.3.0]nonane ring systems by self-cyclization of (Z)- and (E)-2-(trimethylsilylmethyl)pentadienal derivative

The two title carbon frameworks were synthesized utilizing a new type of iron-induced cyclization reaction of 2-(trimethylsilylmethyl)pentadienal. 2-Methylspiro[4.5]dec-2-en-1-one was obtained from (Z)- and (E)-4-cyclohexylidene-2-(trimethylsilylmethyl)but-2-enal. It was found that the (Z)-substrate isomerized to (E)-intermediate followed by cyclization to afford the initial product, 2-methylenespiro[4.5]dec-3-en-1-ol, which was isomerized to the above product. The cyclization of 4-(4-alkyl)cyclohexylidene-2-(trimethylsilylmethyl)but-2-enal proceeded stereoselectively. While, (E)-3-(cyclohex-1-en-1-yl)-2-(trimethylsilylmethyl)prop-2-en-1-al cyclized immediately affording 8-methylenebicyclo[4.3.0]non-9-en-7-ol. The corresponding (Z)-isomer gave several cyclization products as a complex mixture.     

[f]-Fused purine-2,6-diones: Synthesis of new [1,3,5]- and [1,3,6]-thiadiazepino-[3,2-f]-purine ring systems

Summary 6-Phenyl-1,3-dimethyl-2,4-dioxo-1,2,3,4,8,9-hexahydro-[1,3,5]-thiadiazepino-[3,2-f]-purine (5) was obtained by a three-step synthesis from 8-mercapto-1,3-dimethyl-3,7-dihydro-1H-purine-2,6-dione (1) and 2-(benzoylamino)-ethyl chloride (2)via 8-(benzoylaminoethylthio)-1,3-dimethyl-3,7-dihydro-1H-purine-2,6-dione (3) and its chloromido derivative4. The analogous 9-phenyl-1,3-dimethyl-2,4-dioxo-1,2,3,4,6,7-hexahydro-[1,3,6]-thiadiazepino-[3,2-f]-purine (7) was synthesized either from compound1 and N-(2-chloroethyl)-benzimido chloridevia N-(chloroethyl)-S-(1,3-dimethyl-2,4-dioxo-1,2,3,4-tetrahydro-7H-purin-8-yl)-benzothioimide (6), or alternatively from 7-(2-benzoylaminoethyl)-8-bromo-1,3-dimethyl-3,7-dihydro-1H-purine-2,6-dione (9), its 8-mercapto derivative10 and the corresponding chloroimido compound11 being the intermediates.Part of this paper was presented as a preliminary report at the Congress of Czech and Slovak Chemical Societies, Olomouc, Czech Republic, September 13–16, 1993     

One-pot synthesis of 7-bromo-1-[4-(1-cyano-1-methylethyl)]-phenyl-[1,2,4]-triazole-[4,3-a]-quinoxalin

[1,2,4]-Triazole-[4,3-a]-quinoxaline is an important component of many drugs. The yield of the reported methods for triazole cyclization step was usually as low as 20%. In this article, the triazole cyclization step was successfully done by using microwave method with a high yield of 75% for the first time.     

Synthesis and Crystal Structure of 1-（4-Fluorophenyl）-2-hexylthiobenzo[4,5]-furo[3,2-d]-1,2,4-triazolo[1,5-a]pyrimidin-5（1H）-one

The crystal structure of the title compound 1-(4-fluorophenyl) -2-hexylthio-benzo [4,5]furo[3,2-d]-1,2,4-triazolo[1,5-a]pyrimidin-5(1H) -one(C23H21FN4O2S,Mr = 436.5) has been prepared and determined by single-crystal X-ray diffraction. The crystal is of monoclinic,space group P21/n with a = 13.9854(3) ,b = 17.2678(4) ,c = 18.1828(5) ,β = 99.364(2) °,V = 4332.58(18) 3,Z = 4,Dc = 1.338,F(000) =1824,μ = 0.185 mm-1,MoKa radiation(λ = 0.71073) ,R = 0.0538 and wR = 0.1162 for 4728 observed reflections with I > 2σ(I) . X-ray diffraction analysis reveals the fused rings of benzo[4,5]furo[3,2-d]-1,2,4-triazolo[1,5-a] pyrimidin-5(1H) -one system are nearly coplanar. The crystal packing is mainly stabilized by weak intermolecular C-H···O hydrogen bond and π-π interactions.     

Phenylethinyl-[1,3,2]dithiaphospholan. Bis(dithiaphospholanyl)-[1,4]dithian

Phenylethinyl-[1,3,2]dithiaphospholane. Bis(dithiaphospholanyl)-[1,4]dithiane Nucleophilic substitution of the amino group but no cycloaddition occurs in the reaction of phenyl phenylethinyl phosphinous acid diethylamide, 5 , with 2-aminothiophenol forming compound 6 . By analogous reaction, phenylethinyl phosphonic bis(diethylamide), 7 , and ethane-1,2-dithiol form compound 8 . Cycloaddition besides nucleophilic substitution is observed, however, when acetylene bis(phosphonic diethyl-amide), 9 , and ethane-1,2-dithiol are reacted resulting in compound 11 . All new products are characterized by their nmr, mass, and i.r. spectra. Furthermore, the results of an X-ray structure analysis of 11 are reported.     

Studies on the Synthesis of New 3-(3,5-Diamino-1-substituted-pyrazol-4-yl)azo-thieno[2,3-b]pyridines and 3-(2-Amino-5,7-disubstituted-pyrazolo[1,5-a]pyrimidine-3-yl)azothieno[2,3-b]pyridines

Coupling the diazonium salt of 3-amino-2-cyano-4,6-dimethylthieno[2,3-b]pyridine 1 with malononitrile 2 gave 2-cyano-3-(hydrazonomalononitrile)-4,6-dimethylthieno[2,3-b]pyridine 3 which then reacted with hydrazine compounds 4a-4h to yield corresponding 2-cyano-3-(3,5-diamino-1-substituted-pyrazol-4-yl)azo-4,6-dimethylthieno[2,3-b]pyridines 5a-5h. The 2-cyano-3-(2-amino-5,7-disubstituted-pyrazolo-[1,5-a]pyrimidine-3-yl)azo-4,6-dimethylthieno[2,3-b]pyridines 7a-7f were obtained in good yield by the cyclocondensation reaction of 2-cyano-3-(3,5-diamino-pyrazol-4-yl)azo-4,6-dimethylthieno[2,3-b]pyridine 5a with the appropriate 1,3-diketones 6a-6f under acidic condition.