N-正丁基-1-脱氧野尻霉素的合成

在植物和微生物体内广泛存在一系列类单糖化合物,其糖环氧被氮原子取代,异头碳羟基或保留或已脱去,统称为氮杂糖(azasugar).     

1-烷基-2-甲基咪唑衍生物的高效简便合成

本文优化了溴乙烷与2-甲基咪唑的N-烷基化反应条件,并且高收率地合成了一系列具有抗菌活性的1-烷基-2-甲基咪唑衍生物。     

A facile and efficient synthesis of bisazine derivatives

1,4‐Phenylenediamine was condensed with acetylacetone to give 4,4′‐[1,4‐phenylenedi‐(nitrilo)]‐dipenten‐2‐ol 1 . Compound 1 reacted with different organic reagent to give bisazine derivatives. © 2004 Wiley Periodicals, Inc. Heteroatom Chem 15:293–299, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20017     

Determination of 1-deoxynojirimycin in the Larvae of the Silkworm,Bombyx mori,by High-Performance Liquid Chromatography

1-Deoxynojirimycin, known to be one of the most potent α-glycosidase inhibitors, has been used as an antihyperglycemia agent. In this study, a rapid method for the determination of 1-deoxynojirimycin in the larvae of the silkworm, Bombyx mori was established, using high-performance liquid chromatography equipped with fluorescence detection after derivatization with 9-fluorenylmethyl chloroformate. The 1-deoxynojirimycin was efficiently extracted from the larvae using 0.05 mol/L hydrochloric acid, vortexing for 15 s at room temperature, followed by sonication for 30 min. The linear dynamic range extended from 0.7 to 28 µg/mL (r = 0.9999). The average recovery of the 1-deoxynojirimycin was 104% with a relative standard deviation of 3.30%. The limit of detection was 0.05 µg/mL at a signal-to-noise ratio of 3. There were high concentrations of 1-deoxynojirimycin in the larvae, reaching 0.50% of total body mass in the gluttonous stage of the third instar and significant variation in the fifth instar, suggests that the larvae may be a valuable source of 1-deoxynojirimycin for the treatment of carbohydrate-mediated disorders.     

Asymmetric total synthesis of (+)-1-deoxy-6-epi-castanospermine

(+)-1-Deoxy-6-epi-castanospermine was asymmetrically synthesized in ten steps from α-furfuryl amine derivative 6 in 2.9% overall yield. The kinetic resolution of α-furfuryl amine derivative 6 and Sharpless AD reaction of 14 were used as key steps.     

Asymmetric synthesis of (+)-1-deoxynojirimycin and (+)-castanospermine

Asymmetric total syntheses of (+)-1-deoxynojirimycin (1) and (+)-castanospermine (2) are described. Starting from diene 3, the required absolute stereochemistry is introduced by an asymmetric hydroxylation followed by epoxidation. An intramolecular cyclization of amine 17 gives access to the corresponding tetrasubstituted piperidine 18, which is a precursor to compounds 1 and 2. (+)-Deoxynojirimicyn (1) was obtained in 36% yield over 11 steps from diene 3, while (+)-castanospermine (2) was achieved in 13% after 19 steps from the same starting material.     

A highly facile and efficient one-step synthesis of N6-adenosine and N6-2'-deoxyadenosine derivatives

[reaction: see text] A highly facile and efficient one-step synthesis of N6-adenosine and N6-2'-deoxyadenosine derivatives has been developed. Treatment of inosine or 2'-deoxyinosine, without protection of sugar hydroxyl groups, with alkyl or arylamines, in the presence of BOP and DIPEA in DMF, led to the formation of N6-adenosine and N6-2'-deoxyadenosine derivatives in good to excellent yields. Carcinogenic polyaromatic hydrocarbon (PAH) N6-2'-deoxyadenosine adduct 10 and a rare DNA constituent 11 were thus synthesized directly from 2'-deoxyinosine both in 98% yield.     

Domino-Knoevenagel-hetero-Diels-Alder reactions: an efficient one-step synthesis of indole-annulated thiopyranobenzopyran derivatives

Rapid one-step synthesis of hitherto unreported indole-annulated pentacyclic heterocycles containing oxygen, nitrogen, and sulfur has been described by domino-Knoevenagel-hetero-Diels-Alder reaction. The reaction sequence provides a route to the synthesis of a novel type of polyheterocycles in excellent yields with high stereoselectivity.     

HPLC-ELSD在1-脱氧野尻霉素,葡萄糖和葡萄糖胺的杂质分析中的应用

建立了一种高效液相分析方法可用于1-脱氧野尻霉素,葡萄糖和葡萄糖胺的杂质分析.该方法以乙腈/水酸性系统为流动相体系,色谱柱采用WatersAtlantis HILIC Silica(5 μm,150×4.6 mm),以蒸发光散射检测器(ELSD)进行检测,采用主成分自身对照法用于杂质含量的计算.方法验证结果表明,1-脱氧野尻霉素,葡萄糖和葡萄糖胺在0.008～0.04 mg/mL范围内峰面积对质量浓度呈现良好的线性,线性回归系数分别为0.9993,0.9998,0.9996.1-脱氧野尻霉素,葡萄糖和葡萄糖胺的最低检测浓度分别为0.0045,0.0040,0.0039 mg/mL.3种化合物在0.02,0.04,0.08 mg/mL 3种质量浓度点的重现性良好,RSD%均小于10%.     

A facile electrochemical method for the synthesis of new sulfonamide derivatives of potential biological significance

The electrochemical synthesis of some new sulfonamide derivatives was carried out via the electrochemical oxidation of 2,3-dihydrophthalazine-l,4-dione （1） in the presence of arylsulfinic acids （2a and 2b） as nucleophiles. The results show that, the electrogenerated phthalazine-l,4-dione （lox） participates in a Michael type addition reaction with 2a or 2b and via an EC mechanism to produce the corresponding sulfonamide derivatives. This method provides a one-pot procedure for the synthesis of new sulfonamide derivatives of potential biological significance in good yields without using toxic reagents at a carbon electrode in an environmentally friendly manner.     

A facile and efficient method for the synthesis of N-substituted isoindolin-1-one derivatives under Pd(OAc)2/HCOOH system

A facile and efficient method for the synthesis of N-substituted isoindolin-1-one derivatives from 2-formylbenzoic acid and amine under Pd(OAc)₂/HCOOH system has been described. The whole process is carried out in ligand-free conditions and furnished the desired products by reductive intramolecular cyclization. Furthermore, this procedure is applied successfully for the modification of natural products, such as vindoline and estrone.     

Total synthesis of 3,3-difluorinated 1-deoxynojirimycin analogues

Difluorination of 1-deoxynojirimycin at position C(3) creates a competitive inhibitor 15 of 10 times higher activity against an α-glucosidase than the parent compound. Its screening against a panel of human cell lines showed a low cytotoxicity therefore making this compound an interesting candidate for further clinical investigations.     

p-TSA-catalyzed facile and efficient one-pot eco-friendly synthesis of novel isoxazolyl amino furo[3,2-c]quinolinone derivatives in aqueous medium

A green and operationally simple approach for the synthesis of novel isoxazolyl amino furo[3,2-c]quinolinone derivatives by a one-pot three-component reaction of 4-amino-3-methyl-5 styrylisoxazoles, aryl glyoxal monohydrates and 4-hydroxy-1-methyl-2-quinolinone using p-TSA as the catalyst in aqueous medium was developed. The protocol proves to be an efficient and an environmentally benign in terms of high yields, operational simplicity, clean reaction profile, compatibility with wide range of substrates, water as a solvent and easy purification.     

多环百部生物碱Stemonamine的全合成

以新颖的环氧醇串联Semipinacol重排/Schmidt反应为关键步骤,设计发展了高效构筑含有氮杂季碳中心的[5,5,7]三环骨架1的方法.本文从关键中间体1出发,设计了关键的酮酯缩合反应构筑D环的方法,经过7步转化,高效、高选择性地完成了蔓生百部碱Stemonamine的全合成.     

Convergent stereoselective and efficient synthesis of furanic-steroid derivatives

The stereoselective synthesis of furanic-steroid derivatives involving ring-closing metathesis and catalytic hydrogenation as key steps is described. The synthetic strategy was first illustrated by the synthesis of the furanic-estrane derivative 1 in seven steps starting from estrone and 2-methylene-propane-1,3-diol. This compound initially targeted as a potential inhibitor of 17β-hydroxysteroid dehydrogenase type 1 by a docking experiment was found to inhibit the enzyme. The scope of this new strategy was also extended to furanic-androstane derivatives by synthesizing compound 20.     

A facile and efficient procedure for the synthesis of new benzimidazole-2-thione derivatives

A series of benzimidazole-2-thione derivatives was synthesized using a reaction between the macrocyclic aminal 16H,13H-5:12,7:14-dimethanedibenzo[d,i]-[1,3,6,8] tetraazecine (DMDBTA, 5) and various nucleophiles in the presence of carbon disulfide. A full chemical characterization using IR, 1H-, 13C-NMR and GC-MS analyses of the new compounds is provided. These compounds were separated from the reaction mixture by column chromatography (CC) in highly pure form in 15%-51.4% yield.