双二茂铁基吡咯衍生物电荷交互通道

以二茂铁炔烃为原料通过“一锅法”环加成反应合成了一系列2,5-双二茂铁基-1-苯基-吡咯衍生物, 包括: 2,5-双二茂铁基-1-(3-三氟甲基苯基)-吡咯(1), 2,5-双二茂铁基-1-(4-氟苯基)-吡咯(2), 2,5-双二茂铁基-1-苯基-吡咯(3), 2,5-双二茂铁基-1-(4-乙基苯基)-吡咯(4)和2,5-双二茂铁基-1-(4-乙氧基苯基)-吡咯(5), 使用元素分析, 傅里叶变换红外(FTIR)光谱, 质谱(MS)和核磁共振(NMR)等手段对化合物进行了结构表征. 采用循环伏安法(CV), 密度泛函理论(DFT)模拟计算研究了苯基上取代基对双二茂铁间电荷交互的影响. 研究发现第一氧化电位(E_a1), 峰电位差(ΔE)与取代基的哈米特常数(σ), 吡咯¹H NMR的化学位移(δ), 吡咯N原子自然轨道(NBO)电荷之间存在显著线性关联; 同时发现, N原子电荷密度升高, 双二茂铁间电荷交互能力减弱, N原子电荷密度降低, 双二茂铁间电荷交互能力提高. 因此这类双二茂铁基吡咯衍生物中N原子电荷密度对双二茂铁间电荷交互起着关键的影响作用.     

3-乙酰基取代吡咯衍生物的合成及其晶体结构

本文通过Knorr合成法制备了四个3-位乙酰基取代的吡咯衍生物:1, 2-二甲基-4-异丙基-5-苯基-3-乙酰基-吡咯(5a); 1, 2, 4-三甲基-5-对甲氧苯基-3-乙酰基-吡咯(5b); 1, 2, 5-三甲基-4-苯基-3-乙酰基-吡咯(5c); 1, 2, 5-三甲基-4-对甲氧苯基-3-乙酰基-吡咯(5d)。通过红外, 质谱, 核磁等方法对其结构进行了表征。测定了其中三个化合物的晶体结构。对这类吡咯环上4或5-位有芳环取代基时化合物的晶体结构特征进行了扼要讨论, 晶体衍射实验结果表明,4, 5-位上的芳环与吡咯环本身处于非共平面结构。     

苯基吡咯类杀菌剂的设计合成及三维-定量构效关系(3D-QSAR)研究

为寻找新型吡咯类农药,基于杀菌剂氟咯菌腈设计合成了21个苯基吡咯类化合物,在吡咯环上引入甲基基团,其目的是探究N位取代基对该类化合物活性的影响.通过1H NMR、FTIR、单晶X射线衍射、高分辨质谱、元素分析和熔点测定等对目标化合物结构进行了表征与确认,并通过挥发法培养得到16个目标化合物的单晶结构.5种病原菌抑菌活性测试结果显示:在10mg/L浓度条件下,4-(2-氯苯基)-1H-吡咯-3-腈(4b),4-(2-溴苯基)-1H-吡咯-3-腈(4c),4-(2-(三氟甲基)苯基)-1H-吡咯-3-腈(4d), 4-(2-氯-3-氟苯基)-1H-吡咯-3-腈(4g), 4-(2,3-二氯苯基)-1H-吡咯-3-腈(4h)对4种病菌表现出较好甚至高于阳性对照的抑菌效果,其中化合物4g在1 mg/L浓度条件下对3种病菌的抑制效果仍达到80%以上,而氮位甲基取代的目标化合物对水稻纹枯病菌表现出专一的抑菌活性.为了开发出更有效的抗水稻纹枯病菌化合物,采用比较分子力场分析(Co MFA)方法对20个化合物的水稻纹枯病菌活性进行初步的三维-定量构效关系(3D-QSAR)研究,建立了一个有效的Co MFA模型(q~2=0.503, r2=0.974),展现了良好的预测能力,为后续该系列化合物的进一步优化提供了理论支持.     

一种新型α-甲氧基甲基吡咯的合成

以乙酰乙酸苄酯(4)为原料,经Knorr缩合制备了2,4-二甲基-3-丙酸甲酯基-5-羧酸苄酯基-1-氢吡咯(2)和2,4-二甲基-3-羧酸甲酯基-5-羧酸苄酯基-1-氢吡咯(3)。乙醚介质中,溴水氧化条件下,吡咯(2)发生自身缩合生成二吡咯甲烷(7),吡咯(3)无反应发生。在Pb(OAC)4氧化条件下,当其浓度为吡咯(3)浓度的2倍时,在80℃,吡咯(3)完全转化,所得产物经HCl甲醇溶液回流,以82%的产率制备了新型2-甲氧基甲基-3-羧酸甲酯基-4-甲基-5-羧酸苄酯基-1-氢吡咯(1)。吡咯(1)、(2)、(3)及二吡咯(7)的结构用核磁、元素分析、质谱和红外测试技术进行了表征。吡咯(1)的构建对进一步研究吡咯构效关系具有一定参考价值。     

1-芳基-3-苯甲酰基-2,5-二苯基吡咯的合成及其性质

文献报导[1],1-芳基-2,5-二甲基3-醛基吡咯和3-亚氩烃甲基吡咯,具有降血压效应。我们曾报导1-芳基-2-甲基-3-乙酰基-5-对氯苯基吡咯和1-芳基-2-甲基-3-乙酰基-5-间硝基吡咯化合物。1-取代-2,5-二苯基吡咯具有止痛作用。     

一种新型α-甲醚基吡咯的合成

以乙酰乙酸苄酯(4)为原料, 经Knorr缩合制备了2,4-二甲基-3-丙酸甲酯基-5-羧酸苄酯基-1-氢吡咯 (2) 和2,4-二甲基-3-羧酸甲酯基-5-羧酸苄酯基-1-氢吡咯(3)。乙醚介质中,溴水氧化条件下,吡咯 (2) 发生自身缩合生成二吡咯甲烷 (7),吡咯 (3)无反应发生。在Pb(OAC)₄氧化条件下,当其浓度为吡咯 (3)浓度的2倍时,在80 ℃,吡咯 (3) 完全转华。所得产物经HCl甲醇溶液回流,以82%的产率制备了新型2-甲氧基甲基-3-羧酸甲酯基-4-甲基-5-羧酸苄酯基-1氢吡咯 (1)。吡咯(1)、(2)、(3)及二吡咯(7)的结构用核磁、元素分析、质谱和红外等测试技术进行了表征。吡咯(1)的构建对进一步研究吡咯构效关系具有一定参考价值。     

甲磺酸达比加群酯杂质的合成

根据甲磺酸达比加群酯工艺,合成了甲磺酸达比加群酯的7个杂质：3-【【【2-｛［(4-氰基苯基)氨基］甲基｝-1-甲基-1H-苯并咪唑-5-基】羰基】(吡啶-2-基)氨基】丙酸（A）, 3-【【【2-【｛［4-(乙氧基)叔胺基］苯基｝氨基】甲基】-1-甲基-1H-苯并咪唑-5-基】羰基】(吡啶-2-基)氨基】丙酸乙酯盐酸盐(B), 3-【【【2-【｛［(4-甲脒基)苯基］氨基｝甲基】-1-甲基-1H-苯并咪唑-5-基】羰基】(吡啶-2-基)氨基】丙酸乙酯盐酸盐(C), 3-【【【2-【【【4-｛［(己氧基)羰基］氨基亚甲胺基｝苯基】氨基】甲基】-1-甲基-1H-苯并咪唑-5-基】羰基】(吡啶-2-基)氨基】丙酸甲酯盐酸盐(D), 3-【【【2-【【【4-【｛［(己氧基)羰基］氨基｝羰基】苯基】氨基】甲基】-1-甲基-1H-苯并咪唑-5-基】羰基】(吡啶-2-基)氨基】丙酸乙酯(E), 3-【【【2-【【【4-【｛［(己氧基)羰基］氨基｝亚氨甲基】苯基】氨基】甲基】-1-甲基-1H-苯并咪唑-5-基】羰基】(吡啶-2-基)氨基】丙酸(F), (Z)-3-【【【2-【【【4-【｛［(N,N′-二己氧基)羰基］脒基｝亚氨甲基】苯基】氨基】甲基】-1-甲基-1H-苯并咪唑-5-基】羰基】(吡啶-2-基)氨基】丙酸乙酯(G),其结构经¹H NMR和ESI-MS确证。     

新型哌啶噻唑类化合物的合成及杀虫活性

为了探寻新型的生物活性化合物,设计并合成了12个未见文献报道的新型哌啶噻唑类衍生物.生物活性测试研究发现,在500μg/m L浓度下,目标化合物对粘虫表现出良好的抑制活性,而且在100μg/m L下,(4-(5-(3-氯苯基)-4-甲基噻唑-2-基)哌啶-1-基)(4-甲基哌嗪-1-基)甲酮(1f)、(5-(3-氯苯基)-4-甲基噻唑-2-基)哌啶-1-基)(4-硝基-1H-吡唑-3-基)甲酮(1g)对粘虫的抑制率均达80%以上,另外在20μg/m L下(5-(3-氯苯基)-4-甲基噻唑-2-基)哌啶-1-基)(4-硝基-1H-吡唑-3-基)甲酮(1g)仍具有50%的杀虫活性.     

新型含异噁唑环的苯腙基吡唑酮与芳偶氮基吡唑酮衍生物的合成

以乙酰乙酸乙酯为起始原料,经四步反应制备了关键中间体3-甲基-5-苯基异嗯唑甲酰肼(2);2分别与取代苯腙基乙酰乙酸乙酯和取代苯腙基乙酰丙酮反应合成了一系列新型的1.(3′-甲基-5′-苯基-异噁唑4′-甲酰基)-3-甲基4-苯腙基吡唑酮和1-(3′-甲基-5′-苯基-异噁唑-4′-甲酰基)-3,5-二甲基4-芳偶氮基...     

几种多取代吡咯的NMR研究(Ⅰ)

本文测定了1-笨基-2-甲基-3-乙酰基-5-对氯苯基吡咯(I)等十个多取代吮咯的¹HNMR谱和其中五个化合物的¹³CNMR谱。归属了共振谱线,证实了各化合物的分子结构。得到了2-甲基-3-乙酰基-5-对氯苯基吡咯基-1在苯衍生物中的经验取代基增量。     

Photochromism of cis(z)-1,2-bispyrryl-substituted ethene derivatives

Photochromism of two bispyrryl-substituted ethenes, 2, 3-bis-(1-p-methoxyphenyl-5-phenyl-2-methyl-3-pyrryl)-2-butene (BPE1) and 2,3-bis(1-p-bromophenyl-4-phenyl-2-methyl-3-pyrryl)-2-butene (BPE2), was studied by laser flash photolysis technique. The results indicate that photocyclization of these compounds proceeds mainly via the excited triplet state, and the cis-trans isomerization proceeds mainly via the excited singlet state. After UV laser pulse irradiation, both photocylization and cis-trans isomerization of BPEl occur, but photocydization is the main reaction. On the other hand, laser photolysis of BPE2 leads mainly to photocydization. The effects of the substituents on the photochromic mechanism are also discussed.     

Synthesis of Novel Pyrrylthieno[2,3-d]Pyrimidines and Related Pyrrolo[1″,2″:1″,6″]Pyrazino[2″,3″:4,5]Thieno[2,3-d]Pyrimidines

4-Methyl-2-phenyl-5-(1-pyrryl)-6-substituted-thieno[2,3-d]pyrimidines ( 3a-c , 4a-c , 5a , b , and 6 ) have been synthesized. Some of the substituents in position 6 were used to build up different sulfur-, nitrogen- and/or oxygen-containing heterocyclic rings at that position. The 4-methyl-2-phenyl-5-(1-pyrryl)-thieno[2,3-d]pyrimidine-6-carboazide ( 20 ) was also used as a key intermediate in the synthesis of the target pyrrolo[1",2":1',6']pyrazino[2',3':4,5]thieno[2,3-d]pyrimidines.     

Multiple pathways in the synthesis of new annelated analogues of 6-benzyl-1-(ethoxymethyl)-5-isopropyluracil (emivirine)

Condensation of 3-(3,5-dimethylphenyl)-2-oxocyclopentanecarboxamide (11) with oxalyl chloride and condensation of ethyl 2-benzylamino-5-methyl-3-phenylcyclopent-1-enecarboxylate (17a) with trimethylsilyl isothiocyanate gave 7-(3,5-dimethylphenyl)-6,7-dihydro-5H-cyclopenta[e][1,3]oxazine-2,4-dione (12) and 1-benzyl-5-methyl-7-phenyl-2-thioxo-1,2,3,5,6,7- hexahydrocyclopentapyrimidin-4-one (18a), respectively. Acid catalyzed ring-closure of 6-(4-methyl-1-phenylpent-3-enyl)-2-thioxo-2,3-dihydro-1H-pyrimidin-4-one (26) and radical mediated ring-closure of 1,3-bis(benzyloxymethyl)-5-bromo-6-(1-phenylbut-3-enyl)-1H-pyrimidine-2,4- dione (32a) gave 5,5-dimethyl-8-phenyl-5,6,7,8-tetrahydro-1H-quinazoline-2,4- dione (28) and 1,3-bis(benzyloxymethyl)-5-methyl-7-phenyl-1,5,6,7- tetrahydrocyclopentapyrimidine-2,4-dione (33), respectively. Annelated emivirine analogues 7-(3,5-dimethylphenyl)-1- ethoxymethyl-1,5,6,7-tetrahydrocyclopentapyrimidine-2,4-dione (4), 1-ethoxymethyl-5,5-dimethyl-8-phenyl-5,6,7,8-tetrahydro-1H-quinazoline- 2,4-dione (5) and 1-ethoxymethyl-5-methyl-7-phenyl-1,5,6,7- tetrahydrocyclopentapyrimidine-2,4-dione (6) were obtained in few steps from 12, 28 and 18a/33, respectively. These new analogues can be considered as conformationally locaTed analogues of emivirine. However, the compounds 4 6 showed lower activities against HIV-1 than emivirine and it is concluded that the locked conformation disfavours activity against HIV-1.     

Research on nitrogen heterocyclic compounds. XV. Synthesis of 1H,4H-pyrazolo[4,3f]pyrrolo[1,2-a][1,4]diazepine derivatives

The synthesis of derivatives of 1H,4H-pyrazolo[4,3-f]pyrrolo[1,2-a][1,4]diazepine, a new tricyclic nitrogen-containing nucleus is reported. Condensation of arylaldehydes with 4-aminomethyl-1-phenyl-5-(1-pyrryl)pyrazole afforded the title compounds. Bischler-Napieralski intramolecular cyclization of 4-acetamidomethyl-1-phenyl-5-(1-pyrryl)pyrazole was also studied. The reaction led to 6-methyl-1-phenyl-1H,4H-pyrazolo[4,3-f]pyrrolo[1,2-a][1,4]diazepine or alternatively to 4-chloromethyl-1-phenyl-5-(1-pyrryl)pyrazole depending on the solvent used.     

Cycloaddition reactions of cyclic ketene-N,S-acetals with 1,2,4,5-tetrazines

Reaction of 3,6-diphenyl-, 3,6-bis(2-pyridyl)- and the unsubstituted 1,2,4,5-tetrazine with 4,5-dihydro-1-methyl-2-(methylthio)pyrrole ( 2 ) and 1-raethyl-2-(methylthio)-4.5,6,7-tetrahydroazepine ( 3 ) gives 4,7-di-R-2,3-dihydro-1-methylpyrrolo[2,3-d]pyridazine ( 4 , R = phenyl, 2-pyridyl, hydrogen) and 6,9-di-R-1-methyl-2,3,4,5-tetrahydropyridazino[4,5-6]azepine ( 5 ), R = phenyl, 2-pyridyl, hydrogen), respectively, in reasonable to good yields. The compounds 4 (R = phenyl, hydrogen) are converted into their corresponding 1-methylpyrrolo-[2,3-d]pyridazines 6 by reaction with potassium permanganate in butanone. Reaction of 3-phenyl-1,2,4,5-te-trazine with 2 and 3 leads to the exclusive formation of the 7-phenyl isomer 4d and 9-phenyl isomer 5d , respectively, indicating that the cycloaddition is regiospecific. The mechanism is discussed.     

Synthesis of Some New Thiazoles and Pyrazolo[1,5-a]pyrimidines Containing an Antipyrine Moiety

Ethyl 2-{2-[4-(2,3-dimethyl-5-oxo-1-phenyl-3-(pyrazolin-4-yl)]-2-cyano-1-(phenylamino)vinylthio}-acetate, 2-[4-(2,3-dimethyl-5-oxo-1-phenyl-(3-pyrazolin-4-yl))(1,3-thiazol-2-yl)]2-(4-oxo-3-phenyl-(1,3-thiazoilidin-2-ylidene))ethanenitrile, 2-[4-(2,3-dimethyl-5-oxo-1-phenyl(3-pyrazolin-4-yl))(1,3-thiazol-2-yl)]-2-(4-methyl-3-phenyl(1,3-thiazolin-2-ylidene))ethanenitrile, 2-(5-acetyl-4-methyl-3-phenyl(1,3-thiazolin-2-ylidene))-2-[4-(2,3-dimethyl-5-oxo-1-phenyl(3-pyrazolin-4-yl))(1,3-thiazol-2-yl)]ethanenitrile, and ethyl 2-(cyano(4-(2,3-dihydro-1,5-dimethyl-3-oxo-2-phenyl-1H-pyrazol-4-yl)thiazol-2-yl)methylene)-2,3-dihydro-4-methyl-3-phenylthiazole-5-carboxylate were synthesized by treatment of 2-(4-(2,3-dihydro-1,5-dimethyl-3-oxo-2-phenyl-1H-pyrazol-4-yl)thiazol-2-yl)-3-mercapto-3-(phenylamino)-acrylonitrile with appropriate halo ketones or halo esters. Also, 4-{2-[5,7-dimethyl-2-(phenylamino)(7a-hydropyrazolo[1,5-a]pyrimidin-3-yl](1,-thiazol-4-yl)}-2,3-dimethyl-1-phenyl-3-pyrazolin-5-one derivatives were synthesized via reaction of 4-{2-[5-amino-3-(phenylamino)pyrazolin-4-yl](1,3-thiazol-2-yl)}-2,3-dimethyl-1-phenyl-3-pyrazolin-5-one with β-diketone or β-keto ester. All synthesized compound were established by elemental analysis, spectral data, and alternative synthesis whenever possible.     

Relationship between the configurations of 2-phenyltetrahydrothiophenium 1-methylides and their rearrangement products

trans-2-Phenyltetrahydrothiophenium 1-methylide (trans-3), which is generated by fluoride ion-induced desilylation of trans-2-phenyl-1-[(trimethylsilyl)methyl]tetrahydrothiophenium salt (trans-2), gave a mixture of 1,4,5,10a-tetrahydro-3H-2-benzothiocine (4) ([2,3]sigmatropic rearrangement product) and 4-methylsulfanyl-1-phenyl-1-butene (5) (Hofmann elimination product). Ylide trans-3 cannot undergo [2,3]sigmatropic rearrangement because the ylide-carbon is too far from the phenyl group, and trans-3 would instead isomerize to cis-3. In this paper, we discuss the mechanism of the isomerization of trans-3 to cis-3.     

Synthesis and Antimicrobial Activities of Some 6-Methyl-3-Thioxo-2,3-Dihydro-1,2,4-Triazine Derivatives

Abstract

4-Arylidene-imidazole derivatives (4a,b) were readily prepared by reacting 4-am- ino-6-methyl-3–thioxo-2,3–dihydro[1,2,4]triazin-5(4H)-one (1) with 4-arylidene-2-phenyl- 4H-oxazol-5-one (2). Reaction of 1 with some aromatic aldehydes in presence of triethylphosphite exclusively afforded the corresponding aminophosphonates 5a-c. Reaction of 1 with 3-phenyl-1H-quinazoline-2,4-dione (6a) and/or 3-phenyl-2-thioxo-2,3-dihydro- 1H-quinazolin-4-one (6b) gave 2-(6-methyl-5-oxo-3-thioxo-2,5-dihydro-3H-[1,2,4]triazin-4-ylimino)-3-phenyl-2,3-dihydro-1H-quinazolin-4-one (7). Moreover, on treating 1 with 2-phenylbenzo[d][1,3]thiazine-4-thione (8), 6-methyl-4-(2-phenyl-4-thioxo-4H-quinazolin-3-yl)-3-thioxo-3,4-dihydro-2H-[1,2,4]triazine-5-one (9) was obtained in 65% yield. Reaction of 1 with 4-sulfonylaminoacetic acid derivatives (10a,b) afforded the corresponding sulfonamides (11a,b), respectively. Acid hydrolysis of 11a afforded 7-aminomethyl-3-methyl[1,3,4]thiadiazole[2,3-c][1,2,4]triazin-4-one (12). 4-Amino-6-methyl-3-(morpholine-4-ylsulfanyl)-4H-[1,2,4]triazin-5-one (14) was prepared by reacting compound 1 with morpholine in presence of KI/I₂, while 3,3′-bis(4-amino-6-methyl-5-oxo-triazinyl)disulfide (16) was obtained by oxidation of 1 with lead tetraacetate. The antimicrobial activity of the products was evaluated against Gram-positive and Gram-negative bacteria as well as the fungus Candida albicans.

[Supplementary materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements for the following free supplemental files: Additional text, figures, and tables.]     

Five-membered 2,3-dioxoheterocycles: XC. Reaction of 4,5-bis(methoxycarbonyl)-1H-pyrrole-2,3-diones with enaminoesters. crystal and molecular structure of 4-methyl 9-ethyl 7-benzyl-3-hydroxy-8-methyl-1-(4-methoxyphenyl)-2,6-dioxo-1,7-diazaspiro[4.4]nona-3,8-diene-4,9-dicarboxylate

1-Aryl-4,5-bis(methoxycarbonyl)-1H-pyrrole-2,3-diones react with ethyl 3-(benzylamino)but-2-enoate and ethyl 3-(benzylamino)-3-phenylacrylate giving 4-methyl 9-ethyl 1-aryl-7-benzyl-3-hydroxy-8-methyl- and 4-methyl 9-ethyl 1-aryl-7-benzyl-3-hydroxy-8-phenyl-2,6-dioxo-1,7-diazaspiro[4.4]nona-3,8-diene-4,9-dicarboxylates.     

A comparison of hydrogen bonding solvent effects on the singlet oxygen reactions of allyl and vinyl sulfides, sulfoxides, and sulfones

The singlet oxygen (¹Δ_g) photooxidations of 2-methyl-3-phenylthio-2-butene (1a), 1-[(4-nitrophenyl)thio]-2,3-dimethyl-2-butene (2c), 2-methyl-3-phenylsulfinyl-2-butene (3), 2-methyl-3-phenylsulfonyl-2-butene (6), and 1-[(4-nitrophenyl)sulfonyl]-2,3-dimethyl-2-butene (7c) were conducted in the following deuterated solvents: acetonitrile, benzene, chloroform, methanol, or methanol/water mixture. In each case the ene allylic hydroperoxide products and/or the [2+2] cycloaddition products were quantified and inspected for possible hydrogen bonding induced differences in product selectivity and regiochemistry. After comparison to literature values for related substrates, the results indicate that only photooxidations of vinyl sulfides are susceptible to hydrogen bonding solvent effects.