几种4-取代-L-脯氨酸衍生物的合成

以Boc-(4R)-羟基-(2S)-脯氨酸为原料,在NaH作用下与苄位溴代试剂发生醚化反应,合成了几种4-取代-L-脯氨酸类手性催化剂,即在(4R)-羟基-(2S)-脯氨酸的4-位上引入不同的苄氧基以期提高其催化活性和脂溶性,并通过1 H NMR、13 C NMR和HRMS对合成产物的结构进行表征,确定其为目标产物.实验结果还表明,当苯环上连有强的吸电子基团时反应很难进行,而当连有给电子基团时反应相对较容易进行且反应条件较温和.     

新型N-杂环取代苯乙酮衍生物的合成

以2-溴-4'-氟苯乙酮(1)为原料,在碳酸钾存在下分别与对甲酚(2a)和邻苯基苯酚(2d)反应制得2-芳氧基苯乙酮化合物(3a和3d);3a和3d分别与咪唑,N-甲基哌嗪和1-(2-嘧啶基)哌嗪经取代反应合成了6个新型的N-杂环取代苯乙酮衍生物,收率63%~81%,其结构经1H NMR,13C NMR,IR和HR-MS表征。     

新型2-溴苯酰胺类小分子CCR5拮抗剂的合成及其GTPγS结合性

以2-羟基-5-溴苯甲醛为起始原料,经取代,还原和NBS溴化反应制得5-溴-2-(4-氯苯甲氧基)溴甲苯(3);以4-哌啶酮盐酸盐为原料,经保护,还原和缩合反应制得N-烯丙基-2-溴-N-哌啶基苯酰胺(7);3和7经取代反应合成了一个新型的非肽类小分子CCR5拮抗剂——N-烯丙基-2-溴-N-{N-[2-(4-氯苯甲氧基)-5-溴苄基]-4-哌啶基}苯酰胺(8),总产率32.5%,其结构经1H NMR,13C NMR,IR和ESI-MS表征。用GTPγS法测试了8的生物结合性。结果表明:8的生物结合性与TD0232接近,其IC50为(8.12±0.3)nmol·L-1。     

N-(2-氨基苯基)-2-喹唑啉酮乙酰胺盐酸盐的合成

本文通过2-溴-N-(2-硝基苯)乙酰胺和取代的喹唑啉酮在NaH催化下发生亲核取代反应,再经过氢化、酸化合成了4个新型常山碱类抗球虫药物-N-(2-氨基苯基)-2-喹唑啉酮乙酰胺盐酸盐(1∶1)。其中,2-溴-N-(2-硝基苯)乙酰胺通过溴乙酰氯与邻硝基苯胺反应制备,取代的喹唑啉酮使用取代的邻氨基苯甲酸与甲酰胺反应合成。所有目标化合物的结构均经1H NMR,IR和HRMS等方法确证。     

6-溴-N-芳基噻吩[2,3-d]并嘧啶-4-胺类化合物的合成新方法

研究了6-溴-N-[3-氯-4-(3-氟苄氧基)苯基]噻吩[2,3-d]并嘧啶-4-胺的合成新方法.以相对廉价的2,5-二羟基-1,4-二噻烷和丙二腈为原料,依次通过Gewald反应、芳环溴代、缩合、环合以及Dimroth重排四步反应得到目标产物6-溴-N-[3-氯-4-(3-氟苄氧基)苯基]噻吩[2,3-d]并嘧啶-4-胺,总产率为56.9%.用1H NMR,IR,MS和HRMS对产物进行了结构表征.并应用该方法,合成了一系列的6-溴-N-芳基噻吩[2,3-d]并嘧啶-4-胺类化合物.研究表明该方法具有原料易得、操作简便、收率较高,且产物容易分离纯化等优点.     

新型苯并吡喃类FSH拮抗剂的合成

以2-溴-4,5-二甲氧基苄溴为起始原料,依次经取代、Sonogoshira偶联、水解、酰化和氧化反应合成了新型FSH拮抗剂——(R)-N-[1-羟基-3-(1H-吲哚-3-基)丙烷-2-基]-3-异丙氧基-8,9-二甲氧基-6H-苯并[c]苯并吡喃-2-甲酰胺,总收率16.8%,其结构经~1H NMR和MS(ESI)确证。     

3-芳氧基-1-丙胺类HIV-1 Tat/PCAF BRD抑制剂的合成及生物活性

为了研究HIV-1 Tat/PCAF BRD抑制剂的构效关系, 合成了6个3-芳氧基-1-丙胺类化合物. 以取代的2-硝基苯酚为起始原料, 在常规加热和微波辐射加热下与1,3-二溴丙烷反应合成3-(2-硝基芳氧基)-1-溴丙烷(3), 结果显示, 微波辐射加热比常规加热下的反应速度明显加快, 收率有所提高. 3和邻苯二甲酰亚胺钾进行N-烷基化反应合成了2-[3-(芳氧基)-丙基]二氢异吲哚-1,3-二酮, 再经肼解得到了目标化合物, 所有化合物的结构均经FTIR, ¹H NMR, ¹³C NMR及HRMS确证. ELISA检测法测定了它们体外抑制HIV-1 Tat/PCAF BRD的活性, 并对影响活性的因素进行了讨论.     

取代-苄氧基吲哚-3-甲醛-(4''''-硝基)苯腙的合成

以取代苄氧基吲哚-3-甲醛和4-硝基苯肼为原料,乙醇为溶剂,通过缩合脱水反应合成了4个新化合物--取代苄氧基吲哚-3-甲醛-(4'-硝基)苯腙,其结构经1H NMR,IR,MS和元素分析表征.     

5-溴-2-羟基苯甲醇的不对称羟基保护

采用分步法对5-溴-2-羟基苯甲醇中的不对称羟基进行了选择性保护.以2,3-二氢吡喃和氯甲醚为保护基,经两步反应得5-溴-2-甲醚氧基苯甲-2-(四氢吡喃)醚,其结构经1H NMR, IR和MS表征.     

合成(R)-2-异戊氧基丙醇的新方法

以(R)-1,2-丙二醇为原料,经伯醇羟基保护、仲醇O-异戊基取代、脱羟基保护三步反应合成了手性醇(R)-2-异戊氧基丙醇,其结构经NMR和MS确证.     

硼氢化钠还原法合成1-(2,4-二氯苯基)-2-氯-乙醇

研究了硼氢化钠还原2,2',4'-三氯苯乙酮制备1-(2,4-二氯苯基)-2-氯-乙醇的两种方法. 考察了温度对反应的影响, 对目标产物和副产物的生成机理进行了探讨. 加入氯化钙、氯化镧等金属氯化物能有效促进反应的专一性, 并对其作用机理进行了探讨. 在非质子溶剂如THF中有阳离子树脂的存在下, 还原反应平稳, 具有高产率和高选择性. 对目标产物进行了结构表征.     

4-羟基偶氮苯与6-氯-5, 12-萘并萘醌反应产物的NMR分析

无水碳酸钾存在下6-氯-5, 12-萘并萘醌与4-羟基偶氮苯在干燥DMF中反应的主要产物在某些反应条件下不是6[4-(苯基偶氮基)苯氧基]-5, 12-萘并萘醌(1)。该未知反应产物2经核磁共振方法研究证实是6-(N, N-二甲氨基)5, 12-萘并萘醌。本文对化合物2的1H-和13C化学位移、偶合信息和结构作了详细归属, 并推测其反应进程, 实验结果表明, 化合物2是由化合物1与溶剂DMF反应生成。     

Brønsted acid catalyzed regioselective aza-Ferrier reaction: a novel synthetic method for alpha-(N-Boc-2-pyrrolidinyl) aldehydes

The 1,4-elimination reaction of (Z)-N-Boc-2-(4-methoxy-2-alkenyloxy)pyrrolidines is shown to proceed with high (1E,3E)-stereoselectivity to afford N-Boc-2-(1,3-dienyloxy)pyrrolidines; the Br?nsted acid catalyzed aza-Ferrier reaction of the N-Boc-2-(1,3-dienyloxy)pyrrolidines (3) provides alpha-(N-Boc-2-pyrrolidinyl) aldehydes in excellent yields with high alpha-regioselectivities.     

A tetramethyl rhodamine (Tamra) phosphoramidite facilitates solid-phase-supported synthesis of 5'-Tamra DNA

5-Carboxy Tamra 1 was conjugated to 4-hydroxypiperidine with BOP and N-methylmorpholine, and the resulting 5-(N-pipyridyl-4-hydroxy)-Tamra carboxamide 2 was treated with 2-cyanoethyl tetraisopropylphosphorodiamidite to give 5-[N-pipyridyl-4-O-(2-cyanoethyl diisopropylphosphoramidite)]-Tamra carboxamide 3. Solutions of 3 were coupled onto the 5'-hydroxyl of solid-phase-supported DNA fragments with standard amidite coupling techniques. Cleavage and deprotection with aqueous tert-butylamine cocktail gave 5-Tamra-functionalized DNA as well as an additional compound without the Tamra chromophore. A mass spectrum of this product showed the incorporation of tert-butylamine. The extra product was completely suppressed by including a 5 min acetylation step after coupling. A model study of 3 coupled onto thymidine-functionalized CPG showed similar results. NMR and mass spectra of cleaved products confirmed the addition of tert-butylamine to the minor product. Coupling a Tamra active ester onto T CPG which was previously coupled with N-(4-methoxytrityl)piperidyl-4-O-(2-cyanoethyl diisopropylphosphoramidite) 4 produced the same major Tamra-bearing product, which coeluted on reverse phase HPLC with the major product generated with 3.     

Investigation of supramolecular inclusion complexes with β-cyclodextrin of 1-(2-ethoxyethyl)-4-(pentyn-1-yl)-4-hydroxypiperidine and 1-(2-ethoxyethyl)-4-(pentyn-1-yl)-4-benzoyloxypiperidine oxalate by NMR spectroscopy

A comparative analysis of ¹H and ¹³C NMR spectra of 1-(2-ethoxyethyl)-4-(pentyn-1-yl)-4-hydroxypiperidine, 1-(2-ethoxyethyl)-4-(pentyn-1-yl)-4-benzoyloxypiperidine oxalate and their inclusion complexes with β-cyclodextrin was performed. The differences in values of chemical shifts of ¹H and ¹³C nuclei of the substrates and the receptor in the inclusion complexes were determined. It was found that the formation of complexes of 1-(2-ethoxyethyl)-4-(pentyn-1-yl)-4-hydroxypiperidine and 1-(2-ethoxyethyl)-4-(pentyn-1-yl)-4-benzoyloxypiperidine oxalate with β-cyclodextrin was accompanied by insertion of one N-ethoxyethyl fragment of the substrate molecule into the inner sphere of one molecule of the receptor.     

One-Pot Synthesis of N-Boc-2, 5-bis(trimethylsilyl)pyrrolidine

Since Daly reported the structure of epibatidine and its potent analgesic activity in 19921, study on the synthesis of epibatidine and its derivatives and relationships between the structure and activity of epibatidine has received much attention2. During the course of our research for the synthesis of epibatidine derivatives, N-boc-2, 5-bis(trimethylsilyl)pyrrolidine 4 was used as the key intermediate to construct the skeleton of epibatidine via the 1, 3-dipolar cycloaddition (Scheme 1). Ac…     

4-氨基-5-[2-(4-氯苯氧甲基)苯并咪唑-1-亚甲基]-1,2,4-三唑-3-硫酮的核磁共振研究

在无水乙醇和KOH存在下,将2-(4-氯苯氧甲基-1-苯并咪唑乙酰肼(1)与CS2反应,合成出了中间体酰肼二硫代甲酸钾盐.此中间体再与过量的水合肼反应,经环化得到一种新化合物4-氨基-5-[2-(4-氯苯氧甲基)苯并咪唑-1-亚甲基]-1,2,4-三唑-硫酮.采用元素分析、IR及NMR技术确定了新化合物的结构,并利用2...     

四甲基二硅桥连双(四甲基环戊二烯基)四羰基二铁的反应性

标题化合物1与HgCl~2反应, 除生成希望的产物2外, 还分离到2的歧化产物3和4。1经Na-Hg还原, 生成Fe-Fe键断裂的双铁负离子5, 5分别与多种氯化物反应, 生成在铁原子上引入取代基的衍生物6, 7和8。以元素分析、IR及^1H NMR谱表征了化合物2-4及6-8的分子结构。     

An Unexpected Discovery in the Willgerodt-Kindler Reaction of Acetophenone——the Formation of the 4-（Benzoylthiocarbonyl）morpholine

The Willgerodt-Kindler reaction of acetophenone was studied.Apart from the normal product 4-(benzylthio-carbonyl)morpholine,another product 4-(benzoylthiocarbonyl)morpholine was obtained unexpectedly.The struc-ture of the latter was confirmed by IR,~1H NMR spectra and X-ray diffraction analysis.The mechanism of the reac-tion was discussed.     

An experimental and in situ IR spectroscopic study of the lithiation-substitution of N-Boc-2-phenylpyrrolidine and -piperidine: controlling the formation of quaternary stereocenters

A general and enantioselective synthesis of 2-substituted 2-phenylpyrrolidines and -piperidines, an important class of pharmaceutically relevant compounds that contain a quaternary stereocenter, has been developed. The approach involves lithiation-substitution of enantioenriched N-Boc-2-phenylpyrrolidine or -piperidine (prepared by asymmetric Negishi arylation or catalytic asymmetric reduction, respectively). The combined use of synthetic experiments and in situ IR spectroscopic monitoring allowed optimum lithiation conditions to be identified: n-BuLi in THF at -50 °C for 5-30 min. Monitoring of the lithiation using in situ IR spectroscopy indicated that the rotation of the tert-butoxycarbonyl (Boc) group is slower in a 2-lithiated pyrrolidine than a 2-lithiated piperidine; low yields for the lithiation-substitution of N-Boc-2-phenylpyrrolidine at -78 °C can be ascribed to this slow rotation. For N-Boc-2-phenylpyrrolidine and -piperidine, the barriers to rotation of the Boc group were determined using density functional theory calculations and variable-temperature (1)H NMR spectroscopy. For the pyrrolidine, the half-life (t(1/2)) for rotation of the Boc group was found to be ～10 h at -78 °C and ～3.5 min at -50 °C. In contrast, for the piperidine, t(1/2) was determined to be ～4 s at -78 °C.