氮杂冠醚的研究VIII:N-取代-2,3-苯并-10-氮杂-1,4,7,13-四氧杂-环十五-2-烯的合成及其对碱金属离子的配合作用

2,3-苯并-10-氮杂-1,4,7,13-四氧杂-环十五-2-烯与溴代烃或溴代多甘醇单烷基醚, 在无水碳酸钾存在下, 在乙腈中缩合制得N-取代-2,3-苯并-10-氮杂-1,4,7,13-四氧杂-环十五-2-烯化合物(1-11), 取代基为:n-C4H9, i-C5H11,n-C7H15, CH2CH2OCH3, CH2CH2OCH2CH3, CH2CH2OC4H9, (CH2CH2O)CH3, (CH2H2O)2C2H5, (CH2CH2O)2C4H9, CH2CH=CH2, 和CH2Ph。本文还考查了化合物2-4和6-11在室温下, 在氯仿-水体系中, 对苦味酸碱金属(Li^+、Na^+和K^+)盐的配合作用。     

氮杂冠醚的研究VIII:N-取代-2,3-苯并-10-氮杂-1,4,7,13-四氧杂-环十五-2-烯的合成及其对碱金属离子的配合作用

2,3-苯并-10-氮杂-1,4,7,13-四氧杂-环十五-2-烯与溴代烃或溴代多甘醇单烷基醚, 在无水碳酸钾存在下, 在乙腈中缩合制得N-取代-2,3-苯并-10-氮杂-1,4,7,13-四氧杂-环十五-2-烯化合物(1-11), 取代基为:n-C4H9, i-C5H11,n-C7H15, CH2CH2OCH3, CH2CH2OCH2CH3, CH2CH2OC4H9, (CH2CH2O)CH3, (CH2H2O)2C2H5, (CH2CH2O)2C4H9, CH2CH=CH2, 和CH2Ph。本文还考查了化合物2-4和6-11在室温下, 在氯仿-水体系中, 对苦味酸碱金属(Li^+、Na^+和K^+)盐的配合作用。     

含吡啶环系西佛碱大环配合物和氮杂大环自由配体的合成

2, 6-二羟甲基吡啶(1)经活性MnO~2氧化得到2, 6-二甲酰基吡啶(2)。邻硝基苯酚与N-取代的二(氯乙基)胺在DMF溶液中反应, 得到N-取代的1, 5-二(邻硝基苯氧基)-3-氮杂戊烷(3a～3c), 再经水合肼/Raney Ni还原, 获得N-取代的1, 5-二(邻氨基苯氧基)-3-氮杂戊烷(4a～4c)。利用Ba^2^+作为模板离子, (2)分别与(4a～4c)反应, 合成了一类新的含吡啶环系西佛碱大环配合物I-III, 配合物I、III与NaBH~4的乙醇溶液还原解络, 得到氮杂大环自由配体IV和V。所有西佛碱大环配合物和氮杂大环自由配体均经元素分析、IR、^1H NMR、MS等证实了它们的结构和组成。     

分子内1,3-偶极环加成反应的研究 I.4-取代苯基(N-4-戊烯基)硝酮的热化学反应性能及其区域选择性

合成并研究了4-取代苯基(N-4-戊烯基)硝酮的热化学反应[取代基为OCH~3(1a),H(1b),Br(1c),NO~2(1d)].环加成反应活性顺序为NO~2>Br>H>OHC~3.反应具有区域选择性,加成物8-(4-取代苯基)-2-氧杂-1-氮杂双环[3.2.1]辛烷(2)和2-(4-取代苯基)-8-氧杂-1-氮杂双环[3.2.1]辛烷(3)的比约为2:1. 1,3-偶极硝酮(1a-1d)可部分转变为双键迁移产物(4a-4d).     

N,N-二(4'-对苯基-2,2'∶6',2″-三联吡啶)-4,13-二氮杂-18-冠-6醚的合成及其光学性能

以Pd(OAc)2/PBut3为催化剂,4'-(对溴苯基)-2,2'∶6',2″-三联吡啶与二氮杂-18-冠-6经取代反应合成了新化合物N,N-二(4'-对苯基-2,2'∶6',2″-三联吡啶)-4,13-二氮杂-18-冠-6-醚(4),收率58.8%,其结构经1H NMR,13C NMR和FT-IR表征。利用紫外光谱和荧光发射光谱研究了4的光学性能,结果表明:4在甲醇中的最大紫外吸收位于358 nm;在350 nm激发波长激发下,4在二氯甲烷中的最大荧光发射峰位于458 nm。     

氮杂冠醚的研究——Ⅷ.N-取代-2,3-苯并-10-氮杂-1,4,7,1 3-四氧杂-环十五-2-烯的合成及其对碱金属离子的配合作用

2,3-苯并-10-氮杂-1,4,7,13-四氧杂-环十五-2-烯前与溴代烃或溴代多甘醇单烷基醚,在无水碳酸钾存在下,在乙腈中缩合制得N-取代-2,3-苯并-lO-氮杂-1,4,7,13-四氧杂-环十五-2-烯化合物(1-11),取代基为:n-C_4H_9,i-C_5H_11,n-C_7H15,CH_2CH_2OCH_3,CH_2CH_2OCH_2CH_3,CH_2CH_2OC_4H_9,(CH_2CH_2O)_2CH_3,(CH_2H_2O)_2C_2H_5,(CH_2CH_2O)_2C_4H_9,CH_2CH=CH_2,和CH_2Ph.本文还考查了化合物2—4和6—11在室温下,在氯仿-水体系中,对苦味酸碱金属(Li~+、Na~+和K~+)盐的配合作用.     

羧酸配体取代基对席夫碱型双核镝(Ⅲ)配合物结构和磁性的影响

以N-(2-羟基-3-甲氧基亚苄基)氨基脲(H2hms)与不同取代基的羧酸(RCOOH)为配体,合成了3例席夫碱类的中心对称双核镝基配合物[Dy2(Hhms)2(C(CH3)3COO)2(H2O)4](NO3)2(1)、[Dy2(Hhms)2(C14H9COO)2(C2H5OH)2(CH3OH)2] [ZnCl4](2...     

N-取代2-(5-氯-2-(金刚基-1-基)-1H-吲哚-3-基)-2-氧代乙酰胺衍生物的合成及其细胞毒活性

以金刚烷甲酰氯为起始原料,经亲核取代、吲哚环合及酰化反应制得中间体2-(5-氯-2-金刚烷-1H-吲哚-3-基)-2-氧代乙酰（4）; 4与取代胺反应合成了14个新的N-取代2-(5-氯-2-(金刚基-1-基)-1H-吲哚-3-基)-2-氧代乙酰胺衍生物(5a~5n),其结构经¹H NMR, ¹³C NMR和HR-MS(ESI)表征。采用MTT法研究了化合物对人子宫颈癌细胞（Hela）、乳腺癌细胞（MCF-7）和人肝癌细胞（HepG-2）的体外抗肿瘤活性。结果显示：化合物2-(5-氯-2-金刚烷-1H-吲哚-3-基)-N-(3-氯-4-氟苯基)-2-氧代乙酰胺（5e）的体外抑制活性最优,IC₅₀分别为14.10、 10.56和8.55 μmol·L^-1。     

含吡啶环系西佛碱大环配合物和氮杂大环自由配体的合成

2,6-二羟甲基吡啶(1)经活性MnO_2氧化得到2,6-二甲酰基吡啶(2)。邻硝基苯酚与N-取代的二(氯乙基)胺在DMF溶液中反应,得到N-取代的1,5-二(邻硝基苯氧基)-3-氮杂戊烷(3a～3c),再经水合肼/Raney Ni还原,获得N-取代的1,5-二(邻氨基苯氧基)-3-氮杂戊烷(4a～4c)。利用Ba~(2 )作为模板离子,(2)分别与(4a～4c)反应,合成了一类新的含吡啶环系西佛碱大环配合物Ⅰ～Ⅲ,配合物Ⅰ、Ⅲ经与NaBH_4的乙醇溶液还原解络,得到氮杂大环自由配体Ⅳ和Ⅴ。所有西佛碱大环配合物和氮杂大环自由配体均经元素分析、IR、~1H NMR、MS等证实了它们的结构和组成。     

N-叔丁氧羰基-3-羟基-1-金刚烷基甘氨酸的合成

以金刚烷甲酸(1)为起始原料,经过酰化,取代,脱羧三步反应一锅法制得金刚烷甲基酮(2),然后氧化甲基得到1-金刚烷基乙醛酸(3),将3与盐酸羟氨反应得到1-金刚烷乙醛酸肟(4),还原4并用BOC酸酐保护氨基得到N-叔丁氧羰基-1-金刚烷基甘氨酸(5),最后经高锰酸钾氧化得到DPP-IV抑制剂沙格列汀中间体N-叔丁氧羰基-3-羟基-1-金刚烷基甘氨酸(6),总收率28%。     

Dimethyl ether chemical ionization of arylalkylamines

The gas-phase reactions of dimethyl ether (DME) ions with a number of biologically active arylalkylamines of the general formula R(1)R(2)C(6)H(3)CHR(3)(CH(2))(n)NR(4)R(5), where R(1) = H or OH, R(2) = H, F, NO(2), OH or OCH(3), R(3) = H or OH, R(4) and R(5) = H or CH(3), have been studied by means of chemical ionization mass spectrometry. Under the experimental conditions used, the most abundant DME ion is the methoxymethyl cation (CH(3)OCH(2)(+), m/z 45). The unimolecular metastable decompositions of the [M + 45](+), [M + 13](+) and [M + 15](+) adducts formed have been interpreted in terms of the initial site of reaction with the amines and the presence of different functional groups in the molecule. This has permitted establishment of general fragmentation patterns for the adducts, and their correlation with structural features of the molecules. The main site of reaction of the ion CH(3)OCH(2)(+) with the amines seems to be the amino group, particularly if the amine is primary, although a competition with attack on the aromatic ring and especially on the benzylic hydroxy group is observed. In a few cases the reaction mechanisms have been elucidated through the use of deuterated amines obtained by H/D exchange with D(2)O.     

An ab initio molecular orbital study of the deprotonation of amines

The geometries of the amines NH₂X and amido anions NHX^?, where X = H, CH₃, NH₂, OH, F, C₂H, CHO, and CN have been optimized using ab initio molecular orbital calculations with a 4-31G basis set. The profiles to rotation about the N? X bonds in CH₃NH^?, NH₂NH^?, and HONH^? are very similar to those for the isoprotic and isoelectronic neutral compounds CH₃OH, NH₂OH, and HOOH. The amines with unsaturated bonds adjacent to the nitrogen atoms undergo considerable skeletal rearrangement on deprotonation such that most of the negative charge of the anion is on the substituent. The computed order of acidity for the amines NH₂X is X = CN > HCO > F ≈ C₂H > OH > NH₂ > CH₃ > H and for the reaction NHX^? + H⁺ → NH₂X the computed energies vary over the range 373–438 kcal/mol.     

芳香叔胺引发丙烯腈光聚合的引发机理

芳香叔胺引发丙烯腈(AN)光聚合是通过形成激基复合物(exciPlex)进行的。紫外光谱和荧光光谱表明,芳香叔胺在基态可以和AN形成电荷转移复合物(CTC),而在激发态可和AN形成exciplc(称定域激发)。CTC经光照亦可激发(称CTC激发)。 定域激发引起光聚合速率为CH_3C_6H_4N(CH_3)_2>C_6H_5N(CH_3)_2>HOCH_2·C_6H_4N(CH_3)_2>CH_3C_6H_4N(CH_2CH_2OH)_2,与芳胺荧光被AN淬灭的Stern-Vo-lmer常数顺序一致。CTC激发引起的光聚合顺序为:CH_3C_6H_4N(CH_3)_2>CH_3C_6H_4N(CH_2CH_2OH)_2>HOCH_2C_6H_4N(CH_3)_2>C_6H_5N(CH_3)_2,与芳胺上取代基推电子能力一致。端基分析表明聚合物有芳胺端基。     

Microwave assisted hydroaminomethylation of alkenes

Hydroaminomethylation of terminal alkenes can be regioselectively carried out in less than 30 min with secondary amines in EtOH under MW irradiation using (PPh₃)₃RhCO(H) and Xantphos or Biphephos as ligands. When primary amines were employed, the corresponding enamines were obtained in good yields. Tris-benzyl allylglycine was transformed into different (basic) benzylated α-amino acids. Moreover, the benzyl protection was removed in few minutes under MW irradiation with Pd(OH)₂ under H₂ atmosphere.     

W(CO)6-catalyzed oxidative carbonylation of primary amines to N,N'-disubstituted ureas in single or biphasic solvent systems. Optimization and functional group compatibility studies

Primary amines undergo carbonylation to N,N'-disubstituted ureas using W(CO)6 as the catalyst, I2 as the oxidant, and CO as the carbonyl source. Preparation of various N,N'-disubstituted ureas from aliphatic primary amines, RNH2 (R = n-Pr, n-Bu, i-Pr, sec-Bu, or t-Bu), was achieved in good to excellent yields. Studies of functional group compatibility using a series of substituted benzylamines demonstrated broad tolerance of functionality during the carbonylation reaction. Preparation of various N,N'-disubstituted ureas from substituted benzylamines, R-C6H4CH2NH2 (R = H, p-OCH3, p-CO2H, p-CO2Et, p-CH2OH, p-SCH3, p-vinyl, p-Cl, p-Br, m-I, p-NH2, p-NO2, or p-CN), was achieved in good yields. For many substituted benzylamines, yields of ureas were higher when a two-phase CH2Cl2/H2O solvent system was used.     

微波诱导低级醇的等离子体化学反应

微波诱导低级醇的等离子体化学反应王真，洪品杰，张承聪，戴树珊（云南大学化学系，昆明，６５００９１）关键词微波，等离子体化学，低级醇等离子体能产生大量的活性自由基、亚稳态粒子和激发态离子，它所包含的能量传递过程和反应过程不仅与反应碰撞理论有关，而且还涉...     

The role of hydrogen bonding on the h-atom-donating abilities of catechols and naphthalene diols and on a previously overlooked aspect of their infrared spectra

Catechols and 1,8-naphthalene diols contain one "free" hydroxyl and one intramolecularly H-bonded hydroxyl group. The "free" hydroxyls are strong hydrogen-bond donors (HBDs) with alpha2H values (Abraham et al. J. Chem. Soc., Perkin Trans. 2 1989, 699) ranging from 0.685 to 0.775, indicating that these compounds have similar HBD properties to those of strongly acidic phenols such as 4-chlorophenol (alpha2H = 0.670) and 3, 5-dichlorophenol (alpha2H = 0.774). Kinetic effects on H-atom abstractions from the diols in HB acceptor (HBA) solvents can be quantitatively accounted for over at least 50% of the available range of solvent HBA activities (as measured by their beta2H values; see Abraham et al. J. Chem. Soc. Perkin Trans. 2 1990, 521) on the basis of a single reactive OH group, the "free" OH. This free OH group is an outstanding H-atom donor in poor HBA solvents; e.g., in hexane rate constants for reaction with the DPPH* radical are 2.1 x 104 M-1 s-1 for 3,5-di-tert-butyl catechol and 2 x 106 M-1 s-1 for 4-methoxy-1,8-naphthalene diol, but only 7.4 x 103 M-1 s-1 for alpha-tocopherol (vitamin E). The diols are much more reactive than simple phenols because the O-H bond dissociation enthalpy of the "free" OH group is weakened by 5-9 kcal/mol by the intramolecular H-bond. The IR spectra of all the diols in CCl4 show two fairly sharp O-H stretching bands of roughly equal intensity separated by 42-138 cm-1. Addition of a low concentration of DMSO, a strong HBA, causes the band due to the intramolecularly H-bonded OH group to decrease in intensity to roughly half the extent that the "free" OH band loses intensity. The latter forms an intermolecular H-bond with the DMSO, the former does not. What has been overlooked in earlier work is that as the DMSO concentration is increased the band due to the intramolecularly H-bonded OH group first broadens and then evolves into a new, lower frequency (by 19-92 cm-1) band. The magnitude of the shift in the frequency of the intramolecular OH band caused by H-bonding of HBAs to the "free" OH group, Deltanu, increases linearly as the HBA activity of the additive increases, e.g., for 3,5-di-tert-butylcatechol, Deltanu/cm-1 = 33.8 beta2H (R 2 = 0.986). This may provide a new and simple method for determining beta2H values.     

Synthesis and characterization of aryl substituted bis(2-pyridyl)amines and their copper olefin complexes: investigation of remote steric control over olefin binding

The aryl-functionalized pyridylamine 2-(i)PrC(6)H(4)N(H)py (1) and bis(2-pyridyl)amines of the type ArN(py)(2) for Ar = Mes (2), 2,6-Et(2)C(6)H(3) (3), 2-(i)PrC(6)H(4) (4), 2,6-(i)Pr(2)C(6)H(3) (5), and 1-naph (6), have been prepared by the palladium-catalyzed cross-coupling of substituted anilines with 2-bromopyridine, and have been characterized by (1)H and (13)C NMR NMR, FTIR, MS, and TGA. Complexes of these new N-aryl bis(2-pyridyl)amines have been prepared for the acid salts [H{ArN(py)(2)}]BF(4) where Ar = Mes (7) and 2-(i)PrC(6)H(4) (8), and the dimeric bridged complexes [Cu{ArN(py)(2)}(μ-X)(Y)](2) where X/Y = Cl(-) and Ar = Ph (9), 2-(i)PrC(6)H(4) (10), and 1-naph (11), in addition to X = OH(-), Y = H(2)O and Ar = Mes (12). The olefin complexes [Cu(Ar-dpa)(styrene)]BF(4) for Ar = Ph (13), Mes (14), 2-(i)PrC(6)H(4) (15), and 1-naph (16), in addition to the norborylene complexes of Ar = Mes (17) and 2-(i)PrC(6)H(4) (18) have been prepared and characterized by (1)H and (13)C NMR, FTIR, and TGA. The crystal structures have been determined for compounds 1-17. Secondary amine 1 crystallizes in hydrogen-bonded head-to-tail dimers, while the N-aryl bis(2-pyridyl)amines 2-6 crystallize in a three-bladed propellar conformation, having nearly planar geometries about the amine nitrogen. The geometry about copper centers in the dimeric complexes 9-12 is distorted trigonal bypyramidal, with the axial positions occupied by one of the two pyridyl nitrogens and one of the bridging ligands (i.e., Cl or OH). The copper atoms in each of the olefin complexes 13-17 are coordinated to the two pyridine nitrogen atoms and the appropriate olefin; consistent with a pseudo three-coordinate Cu(I) cation. Distortion of pyridyl ring geometries about the copper centers, and concomitant bending of the aryl groups away from the CuN(amine) vectors were found to correlate with the steric bulk of the aryl group present in both dimeric and olefin complexes. Such distortion is also observed to a lesser extent in the acid salts as well. The (1)H and (13)C NMR spectra of [Cu(Ar-dpa)(olefin)]BF(4) exhibit an upfield shift in the olefin signal as compared to free olefin. A good correlation exists between the (1)H and (13)C NMR Δδ values and olefin dissociation temperatures, confirming that the shift of the olefin NMR resonances upon coordination is associated with the binding strength of the complex.     

正已醇-邻、间、对二甲苯二元系固液相平衡

Melting temperatures have been measured and the solid-liquid phase diagrams constructed for 1-hexanol＋o-xylene, 1-hexanol＋m-xylene and 1-hexanol＋p-xylene. They are simple eutectic systems. Excess mole Gibbs free energies were calculated at 298.15K, showing larger positive deviations from ideal-solution behavior. The largest values of GmE are 711、 650 and 800 J•mol-1 for {o-C6H4(CH3)2＋C6H13OH}、 {m-C6H4(CH3)2 ＋ C6H13OH} and {p-C6H4(CH3)2＋C6H13OH} respectively.     

Spectral signatures of four-coordinated sites in water clusters: infrared spectroscopy of phenol-(H2O)n (∼20 ≤ n ≤ ∼50)

We report infrared spectra of phenol-(H(2)O)(n) (～20 ≤ n ≤ ～50) in the OH stretching vibrational region. Phenol-(H(2)O)(n) forms essentially the same hydrogen bond (H-bond) network as that of the neat water cluster, (H(2)O)(n+1). The phenyl group enables us to apply the scheme of infrared-ultraviolet double resonance spectroscopy combined with mass spectrometry, achieving the moderate size selectivity (0 ≤ Δn ≤ ～6). The observed spectra show clear decrease of the free OH stretch band intensity relative to that of the H-bonded OH band with increasing cluster size n. This indicates increase of the relative weight of four-coordinated water sites, which have no free OH. Corresponding to the suppression of the free OH band, the absorption peak of the H-bonded OH stretch band rises at ～3350 cm(-1). This spectral change is interpreted in terms of a signature of four-coordinated water sites in the clusters.