3—芳基—5—巯基—1,2,4—均三唑的双—Mannich反应研究

研究了在氯化氢－乙醇溶液中，３－芳基－５－巯基－１，２，４－均三唑与甲醛和伯胺（芳胺或脂肪胺）的双Ｍａｎｎｉｃｈ反应，合成了１３的的稠杂环化合物３，５－二取代０四氢均三唑并「３，４－ｂ」「１，３，５」噻二嗪，经元素分析、Ｉ手ＭＳ确定了结构，初步测定了该类化合物的生物活性。     

Theoretical Studies on Substituent Effect of the Reaction of Amide and Formaldehyde

The thermodynamic properties of the reaction of amide and formaldehyde were calculated via B3LYP method when substituents chosen included CH3,CH2CH3,CH2CH2CH3,CH2CH2CH2CH3,CH(CH3)2,CH2CH(CH3)2,CH(CH3)CH2CH3 and C(CH3)3.Based on the optimization of the structures for reactants and products,the thermodynamic functions of all the species for an actual state were obtained.The thermodynamic data and the equilibrium constants were investigated within a temperature range of 300―343.15 K.The calculated results show that the reaction is exothermic and spontaneous.The trends of all thermodynamic properties are consistent with the temperature.The preferential order of the substituent effect is CH2CH(CH3)2CH(CH3)CH2CH3CH2CH2CH2CH3 CH2CH2CH3CH2CH3≈CH(CH3)2C(CH3)3≈CH3.     

Studies on organophosphorus compounds 52.Structure-reactivity studies of organophosphorus compounds by MNDO calculations

MNDO and MM2(85)methods were used to study the conformation and the structure-reactivity relationship of neutral and acidic phosphorus esters.The calculation results indicate thatfor the most stable conformation,the charge density of phosphoryl oxygen(q_O)is determined notonly by the electronegativity of the substituents,but also by the conformation of the alkoxyl groupson the phosphorus atom.Meanwhile,the conformation of the alkoxyl group provides,as a rule,more important influence on the charge density of the phosphoryl oxygen.However,the energy ofthe highest occupied molecular orbital(EHOMO)is basically dependent on the eletronegativity of thesubstituents,while the donating ability or the withdrawing ability of the neutral phosphorus com-pounds is mainly governed by the EHOMO but not the q_O.This is also true for other kinds of theneutral oxygen-containing compounds.     

硝基烷基膦酸酯碳负离子烷基化反应区域选择性研究

α-或β-硝基烷基膦酸酯双负离子与卤代烷反应, 生成碳-烷基化产物, 反应区域选择性取决于硝基膦酸酯的结构, 讨论了可能的反应机理。     

O,O-二乙基亚磷酰基异氰酸酯与亚苄基苯胺的反应研究

O,O-二乙基亚磷酰基异氰酸酯与亚苄基苯胺反应,当亚苄基苯胺分子中苯环上具有邻位取代基时,产物不是稳定的1,3,4-二氮磷杂环戊烷衍生物,却是α-(O,O-二乙基)膦酰基苄基苯胺.这可能是由于邻位取代基的立体效应阻碍了环加成反应,且中间体水解之故.所得化合物均经元素分析、IR、H、N、AF及MS谱证实.     

1-苯甲酰基-1-甲硫基甲醇与硫脲和芳胺的反应研究

1-苯甲酰基-1-甲硫基甲醇(2)与硫脲(3a)和芳基取代硫脲(3b-3i)在弱酸性条件下回流反应1h,得到5-苯基咪唑啉-2-硫酮-4-酮(4a)和1-芳基-5-苯基咪唑啉-2-硫酮-4-酮(4b-4i),产率72%～89%.而化合物2与芳胺(5a-5f)在弱碱性条件下回流反应3h,则得到2-芳胺基-2-甲硫基苯乙酮(6a-6f),产率为64%～88%.     

微量热法研究漆酶和3,4,5-三羟基苯甲酸的反应

用LKB－2107型微量热系统,在不同的温度(pH＝7.4)条件下,测定了3,4,5－三羟基苯甲酸与漆酶反应的摩尔反应烙、米氏常数、反应速率常数、漆酶的活性并计算了结合能、活化自由能、活化能和活化烟等.在此基础上,应用过渡态理论,从能量变化的角度,对其催化过程进行了分析.由活化摘(△S_≠^T＜0)得出酶－底物过渡态的结构较酶－底物复合物更为有序的结论.     

有机磷化合物的研究XII. α-氨基烃基膦酸的合成

本文较系统地研究了由醛丶酰胺(或丙烯酰胺)丶亚磷酸三苯酯反应, 然后经过水解是合成α-氨基烃基脒酸的新方法,具有操作方便丶得率较高及产物易于纯化的特点.对反机理也作了初步探讨.     

单环手性胍催化的对映选择性Henry反应

从取代乙二胺方便地合成了4个手性单环胍．它们催化苯甲醛或异丁基醛同硝 基甲烷的Henry反应．能以较好的产率得到产物，但产物的对映体纯度不高．苯甲 醛Henry反应产物ee值最高为31％，异丁基醛获得的ee值最高为34％．这一反应速 度快，条件温和，是合成手性硝基醇的有效方法．     

9-氧代桉烷-4-烯-3-酮类似物的DDQ脱氢重排反应机理研究

我们在研究 9-氧代桉烷 - 4-烯 - 3 -酮类化合物的 2 ,3 -二氯 - 5 ,6 -二腈基 - 1 ,4-苯醌 (DDQ)脱氢反应时[1] ,发现 1 4-降桉烷 - 4,1 1 -二烯 - 3 ,9-二酮及其 1 0 - Epimer在 DDQ脱氢条件下发生迁移重排反应 ,生成酚类化合物 .反应式如下 :DDQ脱氢反应已被详细研究 ,并被广泛地用于有机合成中 [2～ 5] ,但这种脱氢重排反应尚未见文献报道 .为了深入研究该反应 ,提出可能的重排机理 .我们参照文献 [6～ 1 0 ]方法 ,用 MVK和 EVK与相应的 2 -甲基 - 1 ,3 -二酮进行 Robinson成环反应 ,合成了一系列具有类似结构的化合物 ,并与 DD…     

1-苯基-3-甲基-4-苯甲酰基吡唑啉酮-5与胺类缔合研究

1-苯基-3-甲基-4-苯甲酸基毗哇琳酮一5（HPMBP）是一类酸性鳌合革取剂,已广泛用于多种元素分离、分析研究［'j．它不仅在单独使用时能很好地革取金属,而且在与有机胺类共同使用时对稀土元素、过渡金属元素有明显的快同革取性能L'·'］．因此研究HPMBP与胺类的相互作用对于分析产生协同作用的原因,改善革取性能是很有必要的．1实验部分1．1试剂HPMBP,化学纯（北京试剂厂）;三千胺（TOA）,FLUKA进口分装试剂,纯度大于99％;伯胺N1923,工业级（上海有机化学研究所化学实验厂）,经减压（267～533Pa）蒸馏,收集413～459K馏…     

Synthesis of heterocyclic compounds from 2-phenyl-1,2,3-triazole-4-formylhydrazine

2-Phenyl-1, 2, 3-triazole-4-formylhydrazine (2) was prepared by hydrazinolysis of the corresponding ester 1. Reaction of 2 with CS₂/KOH gave the oxadiazole derivatives (3) which via Mannich reaction with different dialkyl amines furnished 3-N, N-dialkyl derivatives (4a–c). Also, condensation of 2 with appropriate aromatic acid in POCI₃ yielded oxadiazole derivatives (5a–c), or with aldehydes and ketones afforded hydrazones (6a–c). Cyclization of (6a–c) with acetic anhydride gave the desired dihydroxadiazole derivatives (7a–c). On the other hand, reaction of dithiocarbazate (8) with hydrazine hydrate gave the corresponding triazole derivative (9) which on treatment with carboxylic acids in refluxing POCI₃ yielded s-triazole [3, 4–b]-1, 3, 4-thiadiazole derivatives (10a–b). The structures of all the above compounds were confirmed by means of IR, ¹H NMR, MS and elemental analysis.     

2-芳酰氨基-5-苄基-1,3,4-噻二唑上亚甲基与4-二甲氨基苯甲醛加成反应

1,3,4—噻二唑杂环化合物具有广泛的生物活性,如调节植物生长,杀菌,除草,杀虫等。因此它的合成及其反应引起了化学家的兴趣。Elmoghayar等报道了2—芳酰氨基—5—氰甲基—1,3,4—噻二唑中活泼亚甲基与苯甲醛的反应生成2—芳酰氨基—5—(1＇—氰基苯乙烯基)—1,3,4     

芳香醛与3-甲基-1-苯基-5-吡唑啉酮固相缩合反应的研究

芳香醛与３－甲基－１－苯基－５－吡唑啉酮固相缩合反应的研究李晚陆,麻洪,王永梅,孟继本（南开大学化学系,天津,３０００７１;兰州大学应用化学重点实验室）摘要研究了芳香醛与３－甲基－１－苯基－５－吡唑啉酮在室温固相、熔融状态及Ｌｅｗｉｓ酸催化下的缩合反...     

Versatile ligational behavior of azopyrazolone derived from hydralazine

Five complexes of 3-methyl-4?-(phenylhydrazono)-1-phthalazinyl-2-pyrazolin-5-one (LH) were synthesized. The ligand and complexes were characterized using elemental analyses and various analytical techniques such as IR, UV, NMR, mass spectra, magnetic susceptibility measurements, and thermal decomposition studies such as TG/DTG. The geometries of the complexes with special emphasis on the versatile ligational behavior of LH are discussed. All five complexes have octahedral geometry. In four of the complexes [M(LH)Cl₃] where M?=?Fe(III)/Cr(III) and [M(LH)(OAc)₂H₂O] and M?=?Cu(II)/Ni(II), the ligand was neutral and tridentate. Another copper complex [CuL(OAc)(H₂O)₂] in which the ligand is tridentate, mono-anionic one was also obtained in an excess of aqueous solution. Antifungal studies of the compounds are also carried out.     

Synthesis of heierocyclic compounds from 2-phenyl-1, 2,3-triazole-4-formylhydrazine

2-Phenyl-1, 2, 3-triazole-4-formylhydrazine (2) was prepared by hydrazinolysis of the corresponding ester 1. Reaction of 2 with CS2/KOH gave the oxadiazole derivatives (3) which via, Mannich reaction with different dialkyl amines furnished 3-N, N-dialkyl derivatives (4a-c). Also, condensation of 2 with appropriate aromatic acid in POCl3 yielded oxadiazole derivatives (5a-c), or with aldehydes and ketones afforded hydrazones (6a-c). Cyclization of (6a-c) with acetic anhydride gave the desired dihydroxadiazole derivatives (7a-c). On the other hand, reaction of dithiocarbazate (8) with hydrazine hydrate gave the corresponding triazole derivative (9) which on treatment with carboxylic acids in refluxing POCl3 yielded s-triazole[3,4-b]-1, 3, 4-thiadiazole derivatives (10a-b). The structures of all the above compounds were confirmed by means of IR, 1H NMR, MS and elemental analysis.     

氯代膦烯化合物与零价钯的氧化加成反应机理探讨

与氯代烯烃或芳烃相反, 氯代膦烯与零价钯的氧化加成反应可以在温和条件下进行. 提出了可能的反应机理. 起始卤代膦烯的结构决定了反应历程和最终产物的结构.     

四嗪与一些环烯烃反应机理的理论研究

采用多种密度泛函方法并辅以极化连续介质模型研究了四嗪与一些环烯烃发生[4+2]环加成反应的反应机理,得出反应过程按协同机理进行,即反应过程中只有一个过渡态. 主要使用的方法有：CAM-B3LYP,B3LYP,X3LYP,BMK,LC-wPBE,wB97x,wB97xd,M062x和M11. 这种过渡态的稳定性与前线分子轨道的相互作用有关,从过渡态电荷迁移的方向来看,环烯烃作为电子给体,而四嗪作为电子受体. 反应的难易取决于环烯烃的环的大小,环越大反应越难,这与环在形成过渡态时的变形能有关. 通过气相平动熵和溶液平动熵计算得到的活化自由能的数据,比较发现气相平动能得出的活化自由能离实验估计值相差很远. 而对于溶液中活化自由能垒数据对于大多数计算方法所得的结果比较接近,其中BMK,CAM-B3LYP和X3LYP的结果更合理一些. 同时也发现M062x和M11方法计算的反应速度常数与实验值差别较大,说明这些方法不太适合用来研究此类反应;而考虑色散作用的wB97xd也过高估计过渡态时分子之间的作用能,导致低自由能垒,具体产生的原因在文中进行了详细的讨论.     

1-苯基-3-甲基-5-吡唑啉酮与二羰基化合物的固相反应研究

报道了苯偶酰及其衍生物、对二甲氨基苯偶姻、邻苯二甲酰亚胺与1-苯基-3-甲基-5-吡唑啉酮的固相热反应研究;这个热反应以较高的选择性生成1:1缩合产物的一种异构体,通过IR、^{1HNMR、MS和元素分析确定了新产物的结构,并通过X射线衍射分析确定了其中一个产物的构型。}     

瑞香狼毒中灭蚜活性物质的结构鉴定

报道从瑞香狼毒(StellerachamaejasmeL.)根中发现分离到2个显示高农药活性化合物，能有效杀灭农业重要害虫蚜虫，经波谱及元素分析，确定其结构为1,5-二苯基-1-戊酮(1)和1,5-二苯基-2-烯-1-戊酮(2)。