几丁寡糖结构类似物的化学合成

合成了两个结构新颖的几丁寡糖结构类似物: β-1,3连接的乙酰氨基葡聚二糖和β-1,3连接的乙酰氨基葡聚三糖, 并通过核磁共振和质谱分析确证了其化学结构. 与天然的几丁寡糖不同, 本文所合成的葡聚二糖和葡聚三糖均采取了1→3糖苷键的连接方式, 为研究几丁寡糖诱导植物抗病活性与寡糖区域异构体之间的关系提供有用材料.     

N-杂环-3-N''''-苄氧羰基-β-氨基丁酰胺的合成和结构表征

以具有诱导抗性的β-氨基丁酸(BABA)为先导化合物,合成了8个新的N-杂环-3-N'-苄氧羰基-β-氨基丁酰胺类化合物,所有新化合物经元素分析、1H NMR确证,讨论了目标化合物的合成方法.     

N-芳基-3-N'-苄氧羰基-β-氨基丁酰胺的合成和结构表征

N-芳基-3-N'-苄氧羰基-β-氨基丁酰胺的合成和结构表征     

N-杂环-3-N′-苄氧羰基-β-氨基丁酰胺的合成和结构表征

以具有诱导抗性的 β 氨基丁酸 (BABA)为先导化合物 ,合成了 8个新的N 杂环 3 N′ 苄氧羰基 β 氨基丁酰胺类化合物 ,所有新化合物经元素分析、1 HNMR确证 ,讨论了目标化合物的合成方法     

1,5-苯并硫氮杂-α-氨基-β-内酰胺衍生物的合成及立体结构(Ⅱ)

用一种甘氨酸 N-端保护试剂和 1 ,5 -苯并硫氮杂反应 ,合成了 5个 1 ,5 -苯并硫氮杂 -α-氨基 -β-内酰胺衍生物 ,其结构经元素分析、 1 H NMR,MS和 IR确证 .用 X射线衍射法确定了产物的立体结构 ,结果表明 ,该反应具有立体专一性 ,四元环上的两个取代基位于环的同侧 ,为顺式结构 ,产物分子中的七元环为稳定的类椅式构象 .     

N′叔丁氨基羰基-N-(5-取代苯基-2-呋喃甲酰基)硫脲的合成及对白血病K562细胞增殖的影响

合成;N′-叔丁氨基羰基-N-（取代苯基呋喃甲酰基）硫脲;MTT法;白血病K562细胞     

1,5-苯并硫氮杂(艹卓)-α-氨基-β-内酰胺衍生物的合成及立体结构(Ⅱ)

用一种甘氨酸N-端保护试剂和1,5-苯并硫氮杂反应, 合成了5个1,5-苯并硫氮杂-α-氨基-β-内酰胺衍生物, 其结构经元素分析、 1H NMR, MS和IR确证. 用X射线衍射法确定了产物的立体结构, 结果表明, 该反应具有立体专一性, 四元环上的两个取代基位于环的同侧, 为顺式结构, 产物分子中的七元环为稳定的类椅式构象.     

N'-叔丁氨基羰基-N-(5-取代苯基-2-呋喃甲酰基)硫脲的合成及对白血病K562细胞增殖的影响

将活性基团5-取代苯基呋喃环和叔丁氨基引入酰基硫脲的分子骨架中,设计合成了8个未见文献报道的N'-叔丁氨基羰基-N-(5-取代苯基-2-呋喃甲酰基)硫脲类化合物(5a～5h),结构经元素分析、IR和 1H NMR等测试技术得到确证. 经MTT(溴化3-(4,5-二甲基噻唑-2-基)-2,5-二苯基四氮唑)法观察,首次发现目标化合物对白血病K562细胞的增殖有明显的抑制作用. 在药物浓度为100×10-6 g/mL时,大部分目标化合物对白血病K562细胞生长的抑制率超过了70%,化合物5a对白血病K562细胞生长的抑制率达到77.14%. 其中,目标化合物5f和5h对白血病K562细胞有诱导作用,进一步的测试正在进行中.     

烯胺酮与氨基吡唑的反应：7-芳基-3-氰基-2-取代吡唑并[1,5-a]嘧啶的合成、结构及生物活性

利用3-取代-4-氰基-5-氨基-1H-吡唑分别与取代烯胺酮反应，合成了共12种新的2-取代-3-氰基-7-芳基吡唑并[1,5-a]嘧啶化合物。所有化合物的结构均经红外、核磁、元素分析进行表征。另外，利用X-单晶衍射对化合物4a的结构进一步加以确认。同时提出了反应可能的机理，并对部分化合物的除草活性进行了测试。     

A Novel Synthesis of 2-Amino-2-deoxy-D-gluconic Acid and Its Complexation with Cu（Ⅱ） in Alkaline Medium

A novel synthesis of the functional carbohydrate 2-amino-2-deoxy-D-gluconic acid was introduced and itscomplex formation with Cu(Ⅱ)was investigated to obtain the stability constant for its further applications to thefood and pharmaceutical industries.The equilibrium was investigated by spectrophotometric measurements andprocessed by dual-series linear regression method.Results:the yield of 2-amino-2-deoxy-D-gluconic acid is 70%.The complexation molar ratio is 1:2,the molar apsorptivity of the complex is 39.906 L·mol~(-1)·cm~(-1) at 630 nm,and the stability constant β_n is 6.24×10~5.     

Magnetic Graphene Oxide Anchored Sulfonic Acid as a Novel Nanocatalyst for the Synthesis of N‐aryl‐2‐amino‐1,6‐naphthyridines

Magnetic graphene oxide functionalized with sulfonic acid (Fe₃O₄‐GO‐SO₃H) was used as a new recyclable nanocatalyst for one‐pot synthesis of N‐aryl‐2‐amino‐1,6‐naphthyridine derivatives under solvent free conditions. The catalyst could be easily recovered from the reaction mixture by an external magnet and reused without significant decrease in activity even after 4 runs. This nanocatalyst exhibited better activities to other commercially available sulfonic acid catalysts.     

Copper(II)‐Catalyzed Synthesis of N‐Substituted‐3‐amino‐4‐cyano‐isoquinoline‐1(2H)‐ones by the Reaction of N‐Substituted‐2‐iodobenzamides with Malononitrile

A novel Cu(OAc)₂·H₂O catalyzed coupling reaction of N‐substituted‐2‐iodobenzamides with malononitrile to afford N‐substituted‐3‐amino‐4‐cyano‐isoquinoline‐1(2H)‐ones is described. The reaction proceeded in DMSO at 90°C for 5 h in nitrogen without external ligands.     

Layer‐by‐layer Assembled Multilayers of Graphene/Mono‐(6‐amino‐6‐deoxy)‐β‐cyclodextrin for Detection of Dopamine

Graphene/mono‐(6‐amino‐6‐deoxy)‐β‐cyclodextrin multilayer films composed of graphene sheet (GS) and mono‐(6‐amino‐6‐deoxy)‐β‐cyclodextrin (NH₂‐β‐CD) were fabricated easily by two steps. First, negatively charged graphene oxide (GO) and positively charged mono‐(6‐amino‐6‐deoxy)‐β‐cyclodextrin (NH₂‐β‐CD) were layer‐by‐layer (LBL) self‐assembled on glassy carbon electrode (GCE) modified with a layer of poly(diallyldimethylammonium chloride) (PDDA). Then graphene/mono‐(6‐amino‐6‐deoxy)‐β‐cyclodextrin (GS/NH₂‐β‐CD) multilayer films were built up by electrochemical reduction of graphene oxide/mono‐(6‐amino‐6‐deoxy)‐β‐cyclodextrin (GO/NH₂‐β‐CD). Combining the high surface area of GS and the active recognition sites on β‐cyclodextrin (β‐CD), the GS/NH₂‐β‐CD multilayer films show excellent electrochemical sensing performance for the detection of DA with an extraordinary broad linear range from 2.53 to 980.05 µmol·L^?1. This study offers a simple route to the controllable formation of graphene‐based electrochemical sensor for the detection of DA.     

A New Route to N‐Aryl 2‐Alkenamides,N‐Allyl N‐Aryl 2‐Alkenamides,and N‐Aryl α,β‐Unsaturated γ‐Lactams from N‐Aryl 3‐(Phenylsulfonyl)propanamides

A series of N‐aryl 2‐alkenamides were produced efficiently by treating N‐aryl 3‐(phenylsulfonyl)‐propanamides with potassium tert‐butoxide in THF at 0°C. With out isolation, it was further treated with an additional equivalent of potassium tert‐butoxide and allyl bromide to give N‐allyl N‐aryl 2‐alkenamides in one pot in good yields. Followed by a ring‐closing metathesis reaction, these N‐allyl N‐aryl 2‐alkenamides were respectively converted into corresponding N‐aryl α,β‐unsaturated γ‐lactams in moderate yields.     

Asymmetric Synthesis of All Four Isomers of an Unusual Heterocycle‐Containing Amino Acid: 2‐Amino‐3‐furan‐2‐yl‐pentanoic Acid

All four isomers of a novel β‐branched unusual amino acid were designed and synthesized with high stereoselectivity (>90% de) and in 33% –44% overall yields by the use of 4(R/S)‐5,5‐dimethyl‐4‐phenyl‐oxazolidin‐2‐one as the chiral auxiliary via asymmetric 1,4‐Michael addition, direct or indirect azidation, hydrolysis and hydrogenation reactions.     

Preparation of N‐Fmoc‐Protected (S)‐5‐Amino‐4,4‐difluoro‐7‐methyloctanoic Acid,a Possible Dipeptide Isostere

The title compound 1 was prepared from L ‐leucine. The key steps include a Grignard addition to Bn₂‐leucinal, a CO/CF₂ replacement with Et₂NSF₃ (DAST) and use of a Ph group as synthetic equivalent of a COOH group. The difluoro‐δ‐amino acid 1 was incorporated into a peptide 8 ; tests with various proteases showed no inhibition by this particular peptide.