N-(3-氯丁基-2-基)-2,6-二异丙基苯胺的合成及化学品安全分析

以二异丙基苯胺和3-氯-2-丁酮为原料,首次合成和制备了一种新型的二异丙基苯胺类配体,N-(3-氯丁基-2-基)-2,6-二异丙基苯胺;利用核磁共振（1H NMR,13C NMR）的方法对产物的结构进行表征。对反应温度、反应时间进行了优化,优化后的反应条件下可以成功得到目标产物。该合成方法为未来新型二异丙基苯胺类配体的合成提供了一种新颖的思路。除了实验合成步骤,对实验过程中存在的安全隐患及可能会出现的安全问题进行了剖析和讨论,保证了实验的安全进行。     

配体二-(2-吡啶基)苯基膦的合成及表征

通过强碱性亲核试剂PhP2-与2-氯吡啶反应合成了配体二-(2-吡啶基)苯基膦(PhPPy2),用核磁共振氢谱对该膦配体的结构进行了表征。本合成方法使配体PhPPy2的合成产率提高到83%,且副反应少,合成的产物易分离。     

2,2′-联咪唑衍生物铜配合物的合成、表征及光谱性质

本文合成了1,1′-二（丙酸甲酯）-2,2′-联咪唑和1,1′-二（丙酸乙酯）-2,2′-联咪唑两个配体,并以无水乙醇为溶剂,在常温条件下合成了配体与铜的配合物。通过IR、UV、EA表征,推测其形成了1：1的配合物。铜配位后使两种配体发生荧光猝灭。     

微波辐射下4-氨基-3,5-二羟甲基-1,2,4-三唑的合成

以羟基乙酸,一水合肼为原料,在微波辐射下合成了多齿配体4-氨基-3,5-二羟甲基-1,2,4-三唑。讨论了微波反应时间、微波功率、原料配比对4-氨基-3,5-二羟甲基-1,2,4-三唑收率的影响,得到最优条件;微波反应时间90 min,微波功率480 W,一水合肼/羟基乙酸=1.5/1。新的合成方法使反应时间由文献报道的24 h缩至90 min,缩合反应的收率由文献报道的58%提高到78%。     

三氯化铁催化合成2,3-二氯-5-甲基吡啶

[目的]2,3-二氯-5-甲基吡啶是一类重要的精细化工中间体,开发出一种合成2,3-二氯-5-甲基吡啶的新方法,并优化其合成工艺。[方法]以5-甲基-3,4-二氢吡啶-2(1H)-酮和氯气为起始原料,在三氯化铁及N,N,N',N',N'-五甲基二亚乙基三胺(PMDETA)的催化下合成2,3-二氯-5-甲基吡啶。考察催化剂、配体、温度等因素对反应的影响。[结果]在优化的反应条件下,2,3-二氯-5-甲基吡啶收率75%,纯度99.5%。[结论]该方法操作简单安全,三废少,适合工业化生产。     

3,3′-二羟基-4,4′-联苯二甲酸的合成和表征

联苯二甲酸类化合物是很好的刚性桥联配体,可用于制备纳米多孔材料.设计了一条制备联苯二甲酸类新配体的合成路线,以4-氨基水杨酸为原料,经过4步反应最终合成了新配体3,3′-二羟基-4,4′-联苯二甲酸,并通过红外光谱、核磁共振氢谱和元素分析进行了表征.     

2-甲基-5-取代苯硫基-1,3,4-噻二唑的合成研究

以取代碘苯和2-巯基-5-甲基-1,3,4-噻二唑为原料,合成了一系列2-甲基-5-取代苯硫基-1,3,4-噻二唑类化合物,确定最佳合成条件为:以碘化亚铜作催化剂、2-吡啶甲酸作配体,于70～80℃在二甲基亚砜中反应24～36h。目标化合物结构经核磁共振氢谱、核磁共振碳谱、红外光谱、质谱分析确证。     

5-氯-2，3-二氢-2-羟基-1-氧代-1H-茚-2-羧酸甲酯合成研究进展

综述了5-氯-2,3-二氢-2-羟基-1-氧代-1H-茚-2-羧酸甲酯的各种合成方法。认为研究开发基于手性配体的金属催化剂是提高产品ee值和产率的重要发展途径。     

2,4-二羟基苯甲醛的选择性烷基化研究进展

2,4-二羟基苯甲醛是合成Salen催化剂的一种重要的配体,而烷基化不仅是改变这种配体的一种重要手段,而且还是将这种配体进行高分子化的重要方法。所以本文综述了2,4-二羟基苯甲醛的选择性烷基化的一些研究新进展,以期为合成新型Salen催化剂配体奠定理论基础。     

水溶性3-(2-二苯基膦-苄氧基)-丙烷-1-磺酸钠新配体/钯催化Suzuki反应研究

设计并合成了一种新型水溶性3-(2-二苯基膦-苄氧基)-丙烷-1-磺酸钠配体并进行了结构表征,该配体与四氯钯酸钾组成的催化剂在水中和微波协助下可有效催化芳基卤代烃和芳基硼酸的交叉偶联反应。在最佳的反应条件:N,N-二甲基甲酰胺/水(体积比3∶2)做溶剂,氢氧化钾做碱,微波120℃反应10min,相应的分离产率可以到达83%~97%,氯代芳烃也有较好的偶联产物。     

Eupergit手性配体交换色谱固定相的制备及应用

介绍了以Eupergit C 250L为载体,L-羟脯氨酸盐为手性配体,通过两者间的"一步交联反应",制备出一种新型的Eupergit手性配体交换固定相。交联反应过程简单、高效、副反应少。尝试通过此大颗粒的Eupergit手性配体固定相对丝氨酸手性对映异构体进行拆分,得到了良好的拆分结果。为将来在工业领域内,通过使用制备型拆分柱来拆分手性氨基酸的设想提供了有利的技术支持。     

Asymmetric 1,4‐Addition of Diethylzinc to Cyclic Enones Catalyzed by Cu(I)‐Chiral Sulfonamide‐Thiophosphoramide Ligands and Lithium Salts

The chiral sulfonamide‐thiophosphoramide ligand L1 , prepared from the reaction of (1R,2R)‐(−)‐1,2‐cyclohexanediamine with diphenylthiophosphoryl chloride and p‐toluenesulfonyl chloride, was used as a chiral ligand in Cu(MeCN)₄ClO₄‐promoted catalytic asymmetric addition of diethylzinc to cyclic enones using LiCl as an additive in which up to 90% ee can be realized under mild conditions within 0.5 h. This chiral ligand is stable and recoverable after usual work‐up and can be reused in the same catalytic asymmetric reaction. Moreover, it was found that this series of chiral ligands represents a type of S,O‐bidentate ligands on the basis of ¹H NMR, ³¹P NMR and ¹³C NMR spectroscopic investigations. The linear effect of ligand ee and product ee further revealed that the active species is a monomeric Cu(I) complex bearing a single ligand.     

A chiral diamine bis-phenolate complex of dioxomolybdenum(VI)

A new dioxomolybdenum(VI) complex with a chiral tetradentate ligand is reported. The tripodal ligand containing two nitrogen atoms and two phenolic oxygen atoms was synthesized starting from a chiral diamine precursor. Further reaction with [MoO₂(acac)₂] yielded a monomeric molybdenum complex as a bright yellow solid. The structures of the molybdenum complex and the free diamine bis-phenol ligand were determined by X-ray diffraction.     

L-脯氨酸键合手性配体交换色谱固定相的制备及手性拆分

合成了L－脯氨酸键合手性配体交换固定相，用元素分析和红外光谱对固定相进行了表征。该固定相在反相条件下对DL－氨基酸对映异构体有良好的拆分能力。     

铱催化体系不对称合成手性药物中间体(S)-(-)-1-苯基-1-丙醇

考察了苯丙酮在手性胺膦配体与[IrHCl2(COD)]2组成的催化体系下不对称转移氢化合成(S)-(-)-1-苯基-1-丙醇的反应,通过正交实验考察了反应温度、n(底物)∶n(铱催化剂)、n(铱催化剂)∶n(手性配体)和碱用量对反应的影响。结果表明,在异丙醇中,利用该体系催化苯丙酮反应6 h后,反应转化率可达94.5%,对映选择性(ee)达96.0%。     

催化不对称烷基化反应中氨基醇配体研究进展

二烷基锌对醛的不对称加成反应是合成手性二级醇的有效方法,反应产物手性二级醇是药物、精细化学品、天然产物的重要中间体,手性氨基醇是诱导这类反应手性配体的重要组成部分并且表现出了很高的对映选择性。综述了催化该类反应手性氨基醇配体的一些研究新进展。     

A new chiral diphosphine ligand and its asymmetric induction in catalytic hydroformylation of olefins

A new chiral ligand, 1,6-anhydro-2,4-bis(diphenylphosphino)pyranose (ABDPP), was prepared from -glucose. The ligand was used to prepare a chiral rhodium catalyst system for asymmetric hydroformylation of olefins. For vinyl acetate, the catalytic hydroformylation gave rather high yield (96%), high enantioselectivity (92% ee), and high regioselectivity (b/n=95/5). But for styrene and norbornene, the results were not so good. The rather high sterioselectivity in the hydroformylation of vinyl acetate is explained in terms of the hydrogen bonding between OH group in the ligand molecule and the carbonyl group of vinyl acetate.     

Chiral Graphs: Reduced Representations of Ligand Scaffolds for Stereoselective Biomolecular Recognition,Drug Design,and Enhanced Exploration of Chemical Structure Space

Rational structure-based drug design relies on a detailed, atomic-level understanding of protein–ligand interactions. The chiral nature of drug binding sites in proteins has led to the discovery of predominantly chiral drugs. A mechanistic understanding of stereoselectivity (which governs how one stereoisomer of a drug might bind stronger than the others to a protein) depends on the topology of stereocenters in the chiral molecule. Chiral graphs and reduced chiral graphs, introduced here, are new topological representations of chiral ligands using graph theory, to facilitate a detailed understanding of chiral recognition of ligands/drugs by proteins. These representations are demonstrated by application to all ≈14 000+ chiral ligands in the Protein Data Bank (PDB), which will facilitate an understanding of protein–ligand stereoselectivity mechanisms. Ligand modifications during drug development can be easily incorporated into these chiral graphs. In addition, these chiral graphs present an efficient tool for a deep dive into the enormous chemical structure space to enable sampling of unexplored structural scaffolds.     

Loading Effects and Adsorption Isotherms for Single and Dual Chiral Systems Applying Ligand Exchange Chromatography

The adsorption behavior of five amino acid racemic mixtures applying ligand exchange chromatography for their enantioselelctive separation under the simultaneous interaction of two chiral selectors was investigated. Single and dual chiral systems consisting of a commercially available non-chiral column and a commercially available chiral column using a chiral mobile phase were applied. The adsorption isotherms for three amino acids were determined for both systems only in the linear range due to displacement effects. Additional loading effects investigations reveal decrease of the capacity factors when applying the single chiral system (no base line separation) compared to the dual one. Furthermore, the selectivity for the dual system was always higher than one.     

铱催化体系不对称合成手性药物中间体

考察了1,1-二苯基丙酮在手性双胺双膦配体与[IrHCl2(COD)]2组成的催化体系下不对称转移氢化合成(S)-(-)-1,1-二苯基-2-丙醇的反应,通过正交实验了考察了反应温度、n(底物):n(铱络合物)、n(铱络合物):n(手性配体)以及n(底物):n(KOH)对反应的影响。结果表明,在异丙醇中,利用该体系催化1,1-二苯基丙酮反应2小时后,反应产率可达97.85%,对映选择性(ee值)达到99.35%