4,5-(2＇,3＇-二硫基-1,4-丁二醇)-1,3-二硫杂环戊烯-2-硫酮的合成研究

通过4,5-二硫基-1,3-二硫杂戊烯-2-硫酮(DMIT)的钠盐与2,3-二溴-1,4-丁二醇的反应成功的合成了题目化合物.比较了DMIT钠盐与DMIT锌配合物(DMIT)2Zn(NBu4)2的亲核反应能力,讨论了反应时间、反应温度、碱的用量等条件对反应的影响.并用IR、1HNMR、MS对目标化合物进行了表征.     

新型dmit金属配合物的合成及其电化学性质的研究

以4,5- 二氰乙硫基-1,3- 二硫杂环戊烯-2-硫酮为原料,经醇钠消去保护基团,再与二价金属离子配位,合成了8种双(1,3-二硫杂环戊烯-2-硫酮-4,5-二硫)金属配合物,为dmit型配合物合成提出了一种新方法.研究表明这类配合物有特殊的电化学性质和很强的紫外吸收,并对其形成中性产物的主要原因和室温电导率进行了讨论.     

4,5-二甲基-1,3-二氧杂环戊烯-2-酮的合成

该文以有机碱作为缚酸剂,研究了4-氯-4,5-二甲基-1,3-二氧杂环戊烷-2-酮(CDMDO)脱氯化氢制备4,5-二甲基-1,3-二氧杂环戊烯-2-酮(DMDO)的工艺。优化的工艺条件为:N,N-二甲基苯胺作为缚酸剂,甲苯为溶剂,反应温度110℃,CDMDO转化率70%。     

放射性^99mTc标记的NMDA受体配基N2S2-Memantine的合成

以美金刚胺为原料,先与氯乙酰氯反应,再与二硫二氮缩合,最后与醋酸汞硫化氢反应脱巯基保护基得到标记前体N-[2-(N-(2-巯基乙基))氨基甲酰甲基J-N-(2-巯基乙基)-3,5-二甲基金刚烷胺基乙酰胺.关键化合物N-[2-((2-(S-(4-甲氧基苄基)巯基)乙基)氨基)乙酰基]-S-(4-甲氧基苄基)-2-氨基乙硫醇和N-[2-(S-(4-甲氧基苄基)硫基)乙基]-N-[N-(2-(S-(4-甲氧基苄基)硫基)乙基)氨基)甲酰甲基]-3,5-二甲基金刚烷胺基乙酰胺得到核磁和质谱表征,总收率为32%.     

3-(5-芳基-[1,3,4]噁二唑-2-亚甲硫基)-5-(4-硝基吡咯)-2-基-4-芳基-[1,2,4]三唑的合成及抗菌活性

用3-(4-硝基吡咯)-2-基-4-芳基-1,2,4-三唑-5-硫醇与5-芳基-2-氯甲基-1,3,4-二唑缩合,得到10个新型多杂环化合物。其结构经元素分析、IR、MS及~1HNMR确证。研究了目标化合物的体外抗菌活性(MIC和IC_(50))。结果显示,化合物3-(5-对氯苯基-[1,3,4]二唑-2-亚甲硫基)-5-(4-硝基吡咯)-2-基-4-苯基-[1,2,4]三唑和3-(5-对氯苯基-[1,3,4]二唑-2-亚甲硫基)-5-(4-硝基吡咯)-2-基-4-对甲基苯基-[1,2,4]三唑表现出一定的体外抗菌活性,含硝基吡咯环的二唑多杂环类化合物有可能成为新型结构的抗菌药物。     

吡咯并[2,3-c]氮杂卓-4,8-二酮衍生物的合成

将N-(2-吡咯甲酰基)-β-丙氨酸甲酯(Ⅲ)与卤代烃经烷基化反应得到的产物水解,得到N-(1-烷基-2-吡咯甲酰基)-β-丙氨酸(Ⅱa～Ⅱc),收率84.7%～91.2%;以化合物Ⅱ为原料,在多聚磷酸-P2O5作用下,经分子内环化反应合成了标题化合物1-烷基-6,7-二氢-1H,5H-吡咯并[2,3-c]氮杂-4,8-二酮(Ⅰa～Ⅰc),收率69.1%～77.2%。3步反应总收率为61.8%～69.1%。测定了3个标题化合物对α-葡萄糖苷酶的抑制作用。     

(R)-5-扁桃酰基-3-对甲基哌嗪苯甲酰基-4,6-二氢吡咯[3,4-c]吡唑的合成工艺改进

以甘氨酸为起始原料,经Micheal反应、酯化、氨基保护、环合、得3-氨基-4,6-二氢吡咯并[3,4,c]吡唑-5(1H)-叔丁氧羰基,再经酰化、脱boc保护,生成的化合物与扁桃酸酰化、脱保护得(R)-N-5-(2-甲氧基-2-苯乙酰)-3-([4-(4-甲基哌嗪)苯甲酰基]氨基)-4,6-二氢吡咯[3,4-c]吡唑,总收率为24.5%。     

4，5—（2′，3′—二硫基—1，4—丁二醇）—1，3—二硫杂环戊烯—2—硫酮的合成研究

通过4,5－二硫基－1,3－二硫杂环戊烯－2－硫酮（DMIT）的钠盐与2,3－二溴－1,4－丁二醇的反应成功的合成了题目化合物。比较了DMIT钠盐与DMIT锌配合物（DMIT）2Zn(NBu4）2的亲核反应能力,讨论了反应时间、反应温度、碱的用量等条件对反应的影响。并用IR、^1HNMR、MS对目标化合物进行了表征。     

抗NO生成的JAK3抑制剂的合成及其抗炎活性研究

为了探索抗一氧化氮(NO)生成的两面神激酶3(JAK3)抑制剂的抗炎效果,采用药效团拼接原理设计并合成5个7H-吡咯并[2,3-d]嘧啶衍生物。体外活性评价表明,化合物N-(3-((5-(苯并[d][1,3]二氧杂环戊烯-5-基)-7H-吡咯并[2,3-d]嘧啶-4-基)氨基)苯基)丙烯酰胺(D3)和N-(3-((5-(苯并[d][1,3]二氧杂环戊烯-5-基)-7H-吡咯并[2,3-d]嘧啶-4-基)氨基)苯基)乙酰胺(D4)不仅能有效地抑制NO的合成(5.13±0.48)μmol/L,D4:IC₅₀=(4.67±0.98)μmol/L),对RAW264.7细胞毒性较低(IC₅₀>60μmol/L),而且可以微弱抑制JAK3激酶活性(D3:IC₅₀=272 nmol/L,D4:IC₅₀=849 nmol/L)。其中,化合物D4对角叉菜胶诱导小鼠模型的急性抗炎能力优于D3,可作为抗NO生成的JAK3抑制剂的先导化合物继续研发。     

一些含噻唑杂环的萘酰亚胺衍生物的合成

以6-溴-1H,3H-苯并[de]吡喃-1,3-二酮为起始原料,通过硝化、氢化还原、关环和亚酰化反应,合成了3个含噻唑杂环的萘酰亚胺衍生物:N-丙基-9-苯基-苯并[de]噻唑[4,5-g]异喹啉-4,6-二酮、N-丁基-9-苯基-苯并[de]噻唑[4,5-g]异喹啉-4,6-二酮和N-羟乙基-9-苯基-苯并[de]噻唑[4,5-g]异喹啉-4,6-二酮.产物经过IR、1HNMR和元素分析进行了表征.     

Eine neue Synthese von 4,5-Dihydroxy-pyrazolen

A New Synthesis of 4,5-Dihydroxy-pyrazoles 1-Aryl-pyrazolin-5-ones 1 are converted by Knoevenagel condensation with acetone or by reaction with 2,2-dimethyl-1,3-dioxolane 6 to 1-aryl-4-isopropyliden-pyrazolin-5-ones 2 . The compounds 2 are epoxidized by hydrogen peroxide forming the spiro-epoxides 3 , which can be cleaved to 4,5-dihydroxy-pyrazoles 4 under acidic conditions. 4-Acetoxy-5-hydroxy-pyrazoles 13 are formed directly, when 3 are cleaved in presence of acetic anhydride. The 3,3′,3′-trimethyl-1-(4-nitro-phenyl)-pyrazolin-4-spiro-2′-oxiran-5-one 3b undergoes rearrangement to the 1,3-dioxolo[4,5-c]pyrazole 12 .     

Novel magnesium and zinc porphyrazines containing galactose moieties: Synthesis via click reaction and characterization

In this study, galactose conjugated new magnesium and zinc porphyrazines were synthesized by the cyclotetramerization reaction of 2,3-bis[1-(2,2,7,7-tetramethyltetra-hydro-bis[1,3]dioxolo[4,5-b;4′,5′-d]pyran-5,methyl)-1H-[1,2,3]triazol-4-yl methylsulfanyl]-but 2-enedinitrile. This substituted dicyano compound was prepared via two different routes. One started from cis-1,2-dicyano-1,2-ethylenedithiolate disodium, [1-(2, 2, 7,7-tetramethyltetrahydrobis[1,3]dioxolo[4,5-b;4′,5′-d]pyran-5-yl-methyl)-1H-[1,2,3]triazo-l-4-yl]methanol and ended in a multi-step reaction sequence via Click procedures. The other reaction was between 5-azidomethyl-2,2,7,7-tetramethyltetrahydro-bis[1,3]dioxolo[4,5-b;4′,5′-d]pyran and (2Z)-2,3-bis(prop-2-yl-1-yl-thio)but-2-enedinitrile. A very soluble galactose linked magnesium porphyrazine derivative in common polar solvents and water was achieved by the deprotected isopropylidene groups in TFA and water media. It is first time, zinc porphyrazine complex has been achieved at one-step reaction by using Zn(BuO)₂ as template agent. The new compounds have been characterized by a combination of elemental analysis, ¹H, ¹³C NMR, IR, UV–vis and MS spectral data.     

Intramolekulare 1,3-dipolare Cycloadditionen von Arylaziden mit Alkinylsubstituenten

Intramolecular 1,3-Dipolar Cycloadditions of Aryl Azides with Alkynyl Substituents Reaction of substituted 4-chlorobut-2-ynes 1 with 2-acetaminophenol and 2-aminothiophenol, respectively, leads to the corresponding ethers and thioethers 3 that can be converted into the alkynyl substituted aryl azides 4 by diazotation and reaction with sodium azide. Intramolecular 1,3-dipolar cycloaddition yields 4H-[1,2,3]triazolo [5,1-c] [1,4] benzoxazines and benzothiazines 5 . In the same way 1,4-bis(2-acetaminophenoxy)but-2-yne 6 reacts to a 3-(2-azidophenoxy-methyl)-triazolobenzoxazine 9 . Its thermal decomposition gives the azomethine 11 .     

Regioselective synthesis of new 5-methyl-5H-pyrimido[4′,5′:4,5][1,3]thiazino [3,2-a]perimidines

A convenient and efficient regioselective synthesis of new pyrimido[4′,5′:4,5] [1,3]thiazino[3,2-a]perimidines is described through intermolecular heterocyclization of 2,4-dichloro-5-(chloromethyl)-6-methylpyrimidine and 1H-perimidine-2(3H)-thione in short reaction times under mild conditions.     

3-Amino-4-cyanpyridazine durch Cyclisierung von Nitrilen

3-Amino-4-cyano-pyridazines by Cyclization of Nitriles The reaction of arylglyoxale hydrazones or benzilhydrazone with malononitrile yields the 3-amino-4-cyano-pyridazines 2 which may be converted into substituted 4-amino-pyriimido [4,5-c]pyridazine 3 and 4-amino-isothiazolo[3, 4-c]pyridazines 4 . From ω-hydrazino-acetophenone and malononitrile the 1,2-diaminopyrrole derivative 6 is formed.     

Tetrathiafulvalene. XIX. Synthese und Eigenschaften elektronenleitender Poly-Dithiolenkomplexe mit Ethylentetrathiolat und Tetrathiafulvalentetrathiolat als Brückenliganden

Tetrathiafulvalenes. XIX. Synthesis and Properties of Electron Conducting Poly-Dithiolene Complexes with Ethylene Tetrathiolat and Tetrathiafulvalene Tetrathiolat as Bridge Ligands [1,3]-Dithiolo[4,5-d]-1,3-dithiol-2,5-dione 7 and 5-(5-oxo[1,3]-dithiolo[4,5–d]1,3-dithiole-2-ylidene)[1,3]-dithiolo[4,5–d]1,3–dithiol-2-one 8 were synthesised from 1,3-dithiole-2-thione-4,5-dithiolat. The ligands react with salts of iron, cobalt, nickel, palladium, platinum and copper to give the polymer complexes 22a–g and 23a–e , respectively. Irradiation of 7 in the presence of iron penta-, dicobalt octa- or nickel tetracarbonyl gives the corresponding dithiolene complexes 21a–c . The amorphous insoluble polymer complexes from types 21, 22 , and 23 have been characterised by i.r.-spectroscopy, susceptibility and conductivity measurements. The nickel complexes have the highest electrical conductivity (σ_RT ∼ 10⁻¹Ω⁻¹cm⁻¹, pellets) with a very low activation energy (0,045 eV, 100–300 K) A high electron delocalization in the direction of the polymer chain and an easy charge transfer from chain to chain is supposed.     

Optimized synthesis of AMPA receptor antagonist ZK 187638 and neurobehavioral activity in a mouse model of neuronal ceroid lipofuscinosis

Previous structure-activity relationship studies in the search for a potent, noncompetitive alpha-amino-3-(3-hydroxy-5-methyl-4-isoxazolyl)propionic acid (AMPA) receptor antagonist led to 2,3-dimethyl-6-phenyl-12H-[1,3]dioxolo[4,5-h]imidazo[1,2-c][2,3]benzodiazepine (ZK 187638). However, the first synthesis had some drawbacks regarding reagents, processes, and overall yield, which furthermore decreased when the synthesis was scaled up. Therefore, we now report a new synthetic route for this compound which requires fewer steps and is suited for large-scale production. This compound significantly relieved the symptoms of neuromuscular deficit in mnd mice, a model of neuronal ceroid lipofuscinosis with motor neuron dysfunction. After oral administration, the concentrations of the compound in the brain and spinal cord were about threefold higher than those in the plasma. In summary, this novel AMPA antagonist is accessible through an optimized synthetic route, has good neurobehavioral activity, oral bioavailability, and favorable brain penetration. This opens new possibilities for the treatment of devastating neurological diseases that are mediated by the AMPA receptor.     

Einige ungewöhnliche Umsetzungen des Dinatrium-2-oxo-1,3-dithiol-4,5-dithiolats mit Biselektrophilen

Some Unusual Reactions of Disodium 2-Oxo-1,3-dithiole-4,5-dithiolates with Biselectrophiles Reaction of disodium 2-oxo-1,3-dithiole-4,5-dithiolate (3) with dichloro-maleic anhydride (4) , Mucobromic acid (7) and its pseudoester 9 leads to the formation of the 1,3-dithiolo[4,5-b]-1,4-dithiins 6, 8 and 10. 3 condenses with cis-3,5-dibromo-cyclopentene (15) to yield the tricyclic compounds 16 and 17. 3 is silylated by trimethylsilyltriflate (19) to give the unstable bis(trimethylsilyl)-thioether 20 which reacts with aldehydes and ketones to furnish the 1,3-dithiolo[4,5-d]-1,3-dithiole-2-ones 22a–c .     

Condensation of 4-phenyl-3,5-dicarboethoxycyclopentane-1,2-dione with primary amines

Condensation of the title compound ( 1 ) with primary aromatic amines gave the dianilides ( 2 ), which cyclized to cyclopenta[1,2-c:4,3-c′]diquinolines ( 3 ). Treatment of 1 with o-phenylenediamine or 2,3-diaminopyridine afforded cyclopenta[2,1-b:3,4- b ′]bis[1,5]benzodiazepine ( 4 ) and bis[1,5]pyrido[b]diazepine derivative ( 5 ), respectively. Whereas, with o-aminophenol a mixture of 2c and cyclopenta[2,1- b :3,4- b ′]bis[1,5]benzoxazepine ( 7 ) was obtained. Pechmann reaction of 1 with m-cresol gave the bis[1]benzopyrane ( 9 ). Mannich reaction of 1 with benzylamine afforded the 3-azabicyclo[3.2.1]octane system ( 10 ).     

Synthesis of pyrazolo[4′,3′:5,6]pyrazino[2,3-c]pyrazoles and pyrazolo[4′,3′:5,6]pyrazino[2,3-d]pyrimidines and their application to polyester fibres

4-Nitroso-1-phenyl-3-methyl-5-aminopyrazole ( 1 ) was condensed with ethylcyanoacetate ( 2 ), malononitrile ( 4a ) and 2-cyanomethylbenzimidazole ( 4b ) to yield 6-hydroxy-5-cyano, 6-amino-5-cyano and 6-amino-5-(benzimidazol-2-yl)-3-methylpyrazolo [3,4-b]pyrazines 3, 5a and 5b , respectively. 5-Cyano-6-chloro derivative 6 obtained from 3 was converted to 3-aminopyrazolo[4′,3′:5,6]pyrazino[2,3-c]pyrazoles 8a and 8b by the treatment with hydrazin hydrate ( 7a ) and phenylhydrazine ( 7b ), respectively. Compound 5a was treated with formamide ( 9a ), urea ( 9b ) and thiourea ( 9c ) to give 4-aminopyrazolo[4′,3′:5,6]pyrazino[2′3′-d]pyrimidines 10a–10c. With refluxing acetic anhydride compounds 8a, 8b and 10a gave corresponding acetamido derivatives 8c, 8d and 10d. Compound 5a was treated with ethylorthoformate ( 11 ), acetic anhydride ( 12 ) or benzoylchloride ( 13 ) to give fused benzimidazopyrazolo[4′,3′:5,6]pyrazino[2′,3′-d]pyrimidines, viz., benzimidazol[1,2-c]pyrazolo[4,3-g]pteridines ( 14a–14c ). Some of the compounds 8, 10 and 14 were applied to polyester as disperse dyes and their fastness properties were studied.