氢化喹啉及其芳(杂)环稠合衍生物的合成

通过环己二酮与β-二腈基苯乙烯的Michael加成得到2-氨基-3-氰基-4-芳基-5-氧代-1,4,5,6,7,8-六氢喹啉(1); 4-苯基六氢喹啉(1a)与环己二酮发生胺的加成缩合反应生成2-N-(3-氧代-1-环己烯基)氨基-3-氰基-4-苯基-5-氧代-1,4,5,6,7,8-六氢喹啉(2), 在碱性和氯化亚铜催化下进一步环合成4-苯基-5-氨基-二-(2-氧代环己烷)并[b,g]-1,3-二氢萘啶(3). 芳醛、α-萘胺和环己二酮在乙醇中共回流, 则一锅法完成9-芳基-5,6,7,8,9,10-六氢苯并[c]吖啶酮(4)的合成. 对合成中所涉及的化学反应机理进行了尝试性的讨论. 新化合物1a～4c均经IR, ¹H NMR 及元素分析证明其结构.     

新型环烷烯并嘧啶并噻唑-3-酮类化合物的合成

以环戊酮、环庚酮为起始原料合成的环烷烯并[1,2-d]嘧啶-2-硫酮(2)与氯乙酸、芳香醛反应, 合成具有潜在抗癌活性的稠合杂环化合物5-芳基-2,8-二芳亚甲基-2,3,6,7-四氢-5H,8H-环戊烯并[1,2-d]噻唑并[3,2-a]嘧啶-3-酮(3)以及5-芳基-2,10-二芳亚甲基-2,3,6,7,8,9-六氢-5H,10H-环庚烯并[1,2-d]噻唑并[3,2-a]嘧啶-3-酮(4). 3和4的结构经¹H NMR, IR, MS分析确认.     

2-(取代氨基硫代甲酰基)-3,4,5,6-四氢嘧啶的合成

以N,N'-二取代二硫代草酰胺与1,3-丙二胺在DMSO中进行缩合反应, 合成了一系列2-取代氨基硫代甲酰 基-3,4,5,6-四氢嘧啶, 反应在2 h内完成, 产率56%～76%. 产物结构经元素分析, IR, ¹H NMR及MS确证.     

2-环己氧羰基乙基三氯化锡及其N,N-二乙基二硫代氨基甲酸配合物的合成与结构表征

合成了2-环己氧羰基乙基三氯化锡及其N,N-二乙基二硫代氨基甲酸配合物,通过元素分析、IR、¹H和 ¹³C NMR及X-射线单晶衍射对其结构进行了表征。化合物2属于单斜晶系,C2/c空间群,晶胞参数为a=1.90867(17)nm,b=0.67885(8)nm,c=3.1902(3)nm,β=97.311(7)°,Z=8,μ=1.715mm^-1,R=0.0334。中心锡原子为含有分子内羰基氧原子和N,N-二乙基二硫代氨基甲酸配体的两个硫原子配位的畸变八面体构型。波谱数据表明化合物1和2存在着分子内羰基氧原子对锡原子的配位,而在化合物3和4中这一配位则被两个或三个双齿二硫代氨基甲酸配体所替代。化合物2的理论研究表明AM1半经验计算可以成功预测这类有机锡化合物的几何构型。     

2-甲硫基-7(5)-取代-3-吡唑并[1,5-a]嘧啶甲酸乙酯的区域选择性合成与2D NMR 研究

利用3-甲硫基-4-乙氧羰基-5-氨基-1H-吡唑分别与甲基/芳基烯胺酮反应, 合成了8种新的化合物2-甲硫基-7-取代-3-吡唑并[1,5-a]嘧啶甲酸乙酯(3a～3g)和2-甲硫基-5-甲基-3-吡唑并[1,5-a]嘧啶甲酸乙酯(4a). 化合物的结构均经元素分析, IR, ¹H NMR, MS所证实, 异构体3a和4a的结构进一步由¹³C NMR, HMQC和HMBC确认. 同时, 探讨了区域选择性合成吡唑并[1,5-a]嘧啶类化合物可能的反应机理, 并对部分化合物杀菌活性进行了测试.     

硫代氢化脲嘧啶的合成及其对Hill反应的抑制活性

为了寻找高活性的Hill反应抑制剂, 以β-氨基丙酸为原料, 经过四步反应, 合成了一系列未经文献报道的3-取代硫代氢化脲嘧啶. 所有新化合物的结构均经过¹H NMR, IR和元素分析证. 初步的生物活性测试表明, 所合成的化合物能有效地抑制Hill反应, 如化合物 5j 有很高的抑制活性(IC₅₀＝0.82 g•mL^－1).     

含噁二唑肟醚取代的均三唑水杨醛席夫碱的合成及抗菌活性

4-氨基-5-(4-甲氧苯基)-3-巯基-均三唑(2)在无水乙酸钠作用下与β-氯苯丙酮(3)缩合得氨基三唑硫代苯丙酮(4). 化合物4与盐酸羟胺肟化得羰基肟化物5, 接着与水杨醛缩合得到席夫碱肟6, 用氯甲基噁二唑7a～7e对化合物6的肟羟基醚化得到目标物均三唑噁二唑肟醚1a～1e. 所合成的新化合物结构由元素分析和光谱数据表征, 体外抗菌活性也被试验.     

2-取代硫醚-5-(5,7-二甲基-1,2,4-三唑并[1,5-a]嘧啶基)-1,3,4-噁二唑/噻二唑类化合物的合成及生物活性

以5-氨基-1H-1,2,4-三唑-3-羧酸乙酯为起始原料, 设计合成了11个新型的2-取代硫醚-5-(5,7-二甲基-1,2,4-三唑并[1,5-a]嘧啶基)-1,3,4-噁二唑类化合物(5)和6个新型的2-取代硫醚-5-(5,7-二甲基-1,2,4-三唑并[1,5-a]嘧啶基)-1,3,4-噻二唑类化合物(8). 通过¹H NMR, MS和元素分析对所合成的化合物进行了结构表征. 初步的生物活性测试结果表明, 所合成的化合物均表现出不同程度的除草及杀菌活性, 其中化合物5k和8f的活性最好, 在50 mg/L浓度下对水稻纹枯病菌的抑制率达90%以上.     

5,6-二氢-5-氧杂-1,3-二氮杂菲衍生物的合成

以2,3-二氢-3-氧代-1,3-苯并(c)-α-吡喃(1)为起始原料, 在氢化钠作用下, 通过与羰基α-氢的Claisen缩合反应, 得到3-乙酰基-2,3-二氢-3-氧代-1,3-苯并(c)-α-吡喃(2), 所得β-二酮与脲、硫脲和脒衍生物分别进行缩合关环, 生成5,6-二氢-5-氧杂-1,3-二氮杂菲衍生物3和4. 在相同的条件下, 吡喃酮1与草酸二乙酯进行缩合反应, 给出3-乙氧乙二酰 基-2,3-二氢-3-氧代-1,3-苯并(c)-α-吡喃(5), 选择3-氨基吡唑、2-氨基咪唑、3-氨基三唑、2-氨基苯并咪唑和3,5-二氨基吡唑-4-偶氮苯与5缩合, 分别环合成5,6-二氢-5-氧杂-1,3-二氮杂菲并和五元含氮杂环衍生物6～10. 所合成的新化合物均经核磁共振光谱、红外光谱及元素分析证明其结构.     

N-多氟烷基取代和葡萄糖基取代的1,2,4-三唑-5-硫酮类席夫碱的合成及其杀虫活性

为改善三唑类化合物的生物活性, 以3-苯基-4-氨基-1,2,4-三唑-5-硫酮为原料, 将其与芳香醛在冰醋酸体系中反应, 得到3-苯基-4-芳基亚甲氨基-1,2,4-三唑-5-硫酮类席夫碱(4a～4i). 在此基础上, 化合物4a～4i分别与多氟烷基碘代烷和溴代乙酰基葡萄糖反应合成了一系列1,2,4-三唑-5-硫酮类席夫碱的多氟烷基取代物5a～5r和葡萄糖基取代物6a～6d, 并用¹H NMR, ¹⁹F NMR, IR和MS谱以及元素分析表征了它们的结构. 初步生物活性测试结果表明, 部分目标化合物具有明显的杀虫活性.     

Synthesis and conformational study of 1,2,3,4,5,6,7,8-octahydro-1,6-naphthiridines

A new class of endocyclic enamines, 1,6-disubstituted 1,2,3,4,5,6,7,8-octahydro-1,6-naphthiridines, was synthesized from 4-piperidone imines by successive subjecting the latter to lithiation with lithium diethylamide, to alkylation with 1-bromo-3-chloropropane, and to intramolecular cyclization. All stages were carried out as a unique process without isolation of the intermediate compounds. A thorough optimization of the process conditions, workup, and product storage was carried out. The conformational study of 1,6-disubstituted 1,2,3,4,5,6,7,8-octahydro-1,6-naphthiridines was performed.     

Multicomponent Synthesis of 2,5-Dioxo- and 4-Aryl-5-oxo-2-thioxo-1,2,3,4,5,6,7,8-octahydroquinazolines

Ten 2,5-dioxo- and 4-aryl-5-oxo-2-thioxo-1,2,3,4,5,6,7,8-octahydroquinazolines have been synthesized in three-component interactions of 1,3-cyclohexanedione or dimedone, urea or thiourea, and substituted benzaldehydes (3-bromo-, 4-bromo-, 4-fluoro-, 4-methoxy-, 3,4-methylenedioxy-, and 3-nitro-). 9-Aryl-4,5-dioxo-1,2,3,4,5,6,7,8-octahydro-9H-xanthenes were also formed in these reactions.     

Sequential Diels-Alder reaction of in situ generated 2,3-dimethylenepyrrole and carbodienophiles: rapid synthesis of 2,3,6,7-tetrasubstituted carbazoles

[reaction: see text] 2,3,6,7-Tetrasubstituted-1,2,3,4,5,6,7,8-octahydrocarbazoles 2 were synthesized in 46-90% yields by sequential Diels-Alder reactions from N-benzyl-2,5-dimethyl-3,4-bisacetoxymethylpyrrole (1) and dienophiles such as maleic anhydride, maleimides, ethyl maleate, fumaronitrile, and ethyl acrylate. The 2,3,6,7-tetrasubstituted carbazoles 3 were then synthesized in 32-87% yields from 2 by oxidation with DDQ.     

Synthesis of 9-amino-, 9-aminomethyl-1,2,3,4-tetrahydro- and 1,2,3,4,5,6,7,8-octahydroacridine derivatives

This paper describes the synthesis of 9-amino-2- and 4-hydroxy- and 2,4-dihydroxy-1,2,3,4-tetrahydro-acridines 2 and of 9-aminomethyl-1,2,3,4-tetrahydro- and 1,2,3,4,5,6,7,8-octahydroacridines 3 starting from the corresponding 9-carboxamido derivatives. A new synthetical pathway to 9-amino-2-hydroxyacri-dine 9 is also reported.     

An Efficient Synthesis of 2-Propyl-5-phenyl-1,4-dioxo-1,2,3,4,5,6,7, 8-octahydro-[1,4,2]diazaphosphorino[1,-2a][1,3,2] benzodiazaphosphorine 3-oxide

During the past two decades, a-ketophosphonates and their derivatives have attracted considerable attention because of their special physical, chemical and pharmacological properties due to the proximity of the carbonyl and the phosphoryl groups1-12. In the study on new pharmaceuticals and agrochemicals, the application of heterocycles is suggested to improve the biological activity. A sizeable number of endogenous fused heterocyclic compounds play a key role in regulation of various life pr…     

Steric hindrance ligand strategy to aluminum porphyrin catalyst for completely alternative copolymerization of CO2 and propylene oxide

Aluminum porphyrin complexes are heavy-metal-free and soil-tolerant green catalysts for the copolymerization of CO2 and propylene oxide (PO),but they suffer from relatively poor poly(propylene carbonate) (PPC) selectivity.Herein,steric hindrance porphyrin ligand was used to enhance the PPC selectivity.Typically,a bulky anthracene-like group was incorporated into the porphyrin ring to form 5,10,15,20-tetra(1,2,3,4,5,6,7,8-octahydro-1,4:5,8-dimethanoanthracen-9-yl)porphyrin,the aluminum porphyrin complex with this ligand,in combination with bis(triphenylphosphine)iminium chloride as a co-catalyst,produced completely alternate PPC.Additionally,the obtained PPC showed high regioselectivity,with a head-to-tail linkage content (HT) of 92％.Therefore,we demonstrated that introduction of bulky steric ligand into the porphyrin ring could reduce the propylene oxide homopolymerization activity leading to excellent PPC selectivity,and improve regioselectivity for the PO ring-opening during the copolymerization.     

Synthesis and X-ray crystal structure of a chiral molybdenum porphyrin and its catalytic behaviour toward asymmetric epoxidation of aromatic alkenes

Reaction of M(CO)₆ with H₂P* (5,10,15,20-tetrakis-{(1S,4R,5R,8S)-1,2,3,4,5,6,7,8-octahydro-1,4:5,8-dimethanoanthracene-9-yl}porphyrin) followed by treatment with methanol afforded [Mo^VO(P*)(OMe)] (1) in ∼80% yield. Complex 1 was characterised by IR and ESR spectroscopy and X-ray structure determination. This chiral molybdenum porphyrin was found to catalyse the epoxidation of styrene, cis-β-methylstyrene, and 1,2-dihydronaphthalene with tert-butyl hydroperoxide in up to 29% ee.     

Synthesis of (<Emphasis Type="Italic">S</Emphasis>)-(+)-tylophorine and its seco analogues using free radical reaction

The synthesis of (S)-(+)-tylophorine and its seco analogues has been accomplished by using free radical reaction. (−)-N-(2,3,6,7-Tetramethoxyphenanthren-9-ylmethyl)-2-bromomethylpyrrolidine (7) and (−)-N-(2,3,6,7-tetramethoxyphenanthren-9-ylcarbonyl)-2-bromomethylpyrrolidine (9) have been obtained for the first time in three and two linear steps from 2,3,6,7-tetramethoxyphenanthrene-9-carboxylic acid (4), respectively. When bromide 7 was subjected to the action of tri-n-butyltin hydride and catalytic amount of azobisisobutyronitrile in acetonitrile at reflux, only a new structural N-((2,3,6,7-tetrame-thoxyphenanthren-9-yl)methyl)piperidine (2) was obtained in excellent yield, without expected (+)- tylophorine. As an alternative route, when bromide 9 was treated with azobisisobutyronitrile and tri-n-butyltin hydride in toluene at reflux, tylophorin-9-one (10) was provided in 33.6% yield. At the same time, a new structural (+)-N-((2,3,6,7-tetramethoxyphenanthren-9-yl)carbonyl)-2-methylpyrrolidine (11) was afforded as the main product in 65% yield. Notably, azobisisobutyronitrile plays dual roles in this reaction, and the possible mechanism has been described. Compounds 10 and 11 were reduced by lithium aluminum hydride to give (+)-tylophorine and (+)-N-((2,3,6,7-tetramethoxyphenanthren-9-yl) methyl)-2-methylpyrrolidine (3), respectively.     

Reaction of 5-substituted-2-amino-2-oxazolines with ethoxycarbonyl isocyanate. A route to 2,3,6,7-tetrahydro-4H-oxazolo[3,2-a]-1,3,5-triazine-2,4-diones

The reaction of 2-amino-2-oxazolines with ethoxycarbonyl isocyanate was investigated in order to access to fused 1,3,5-triazine-2,4-diones with a potential 5-HT₂ antagonist activity. The reaction leads to 2,3,6,7-tetrahydro-4H-oxazolo[3,2-a]-1,3,5-triazine-2,4-diones and to 1-carbethoxy-3-(2-iminooxazolidine)ureas. During the carbamoylation the regioselectivity seems to be related to the strong nucleophilic character of the endo nitrogen atom of 2-amino-2-oxazolines. The structures of two compounds were studied by X-ray crystallography. N-Substituted compounds have been prepared by alkylation of the 2,3,6,7-tetrahydro-7-phenoxymethyl-4H-oxazolo[3,2-a]-1,3,5-triazine-2,4-dione.     

cis-and trans-decahydro-1,6-naphthyridines. Stereoselective synthesis and stereochemistry

New 1,6-disubstituted trans-decahydro-1,6-naphthyridines were synthesized by stereoselective nucleophilic addition of hydride and cyanide ions to 1,2,3,4,5,6,7,8-octahydro-1,6-naphthyridines, and their predominant conformations were determined. Some trans-decahydro-1,6-naphthyridine derivatives were found to exhibit anti-HIV activity.