Syntheses and Crystal Structures of Two New α-Aminophosphonate Derivatives Containing Thieno[2,3-d]pyrimidine

Two new α-aminophosphonate derivatives containing thieno[2,3-d]pyrimidine, diethyl(((6-ethyl-2-methyl-4-oxothieno[2,3-d]pyrimidin-3(4H)-yl)amino)(4-methoxyphenyl)methyl)phosphonate(1) and diethyl((4-bromophenyl)((6-ethyl-2-methyl-4-oxothieno[2,3-d]pyrimidin-3(4H)-yl)amino)methyl)phosphonate(2), have been synthesized by a facial phosphorylated reaction, and their structures were characterized by NMR, IR, HRMS and X-ray single-crystal diffraction. Compound 1(C21H28N3O5PS, Mr = 465.49) belongs to the orthorhombic system, space group P212121, with a = 10.83653(16), b = 12.04906(19), c = 18.0061(3) , V = 2351.06(6) 3, Z = 4, Dc = 1.315 g/cm3, μ = 2.177 mm-1, F(000) = 984.0, the final R = 0.0389 and w R = 0.0985 for all data. Compound 2(C20H25Br N3O4 PS, Mr = 514.37) belongs to the orthorhombic system, space group P212121, with a = 10.9187(5), b = 11.9522(4), c = 17.7667(7) , V = 2318.60(16) 3, Z = 4, Dc = 1.474 g/cm3, μ = 4.175 mm-1, F(000) = 1056.0, the final R = 0.0367 and w R = 0.0946 for all data.     

拉曼镊子结合多元统计方法分析两种人体滴虫的差异性

应用单细胞激光拉曼光谱分析技术,对不同来源的阴道毛滴虫和口腔毛滴虫的拉曼光谱数据进行减背景、平滑、基线校正、归一化等处理后做主成分分析(PCA)和辨别函数分析(DFA)等多元统计分析.平均光谱和PCA分析结果表明,阴道毛滴虫和口腔毛滴虫差异最为明显是 1002 cm<'-1>峰,其次,差异相关性最大的还有9个拉曼谱峰7...     

Site-selective DNA hydrolysis induced by a metal-free peptide nucleic acid-cyclen conjugate

A metal-free artificial restriction DNA cutter which is composed of cyclen and classical peptide nucleic acid (PNA) was synthesized. Analysis of DNA cleavage products indicates the site-selective hydrolysis.     

超临界流体色谱法分析非对映异构体d4T-5’-N-磷酰化苯丙氨酸甲酯

采用超临界CO2流体色谱技术,分析d4T-5’-N-磷酰化苯丙氨酸甲酯手性磷的非对映异构体。色谱柱为Hpersil ODS2(250 mm×4.6 mm,5μm),流动相为夹带改性剂甲醇、乙醇和异丙醇的超临界CO2流体。以容量因子、选择性和分离度为指标,考察改性剂、背压和柱温对分离的影响。在甲醇、乙醇和异丙醇3种改性剂中,甲醇为最好的改性剂,其中在7%甲醇改性剂下,该化合物的分离度可达到3.35。在7%甲醇改性剂条件下,考察了压力(10～20 MPa)和温度(303.15～318.15 K)的影响。在优化的分离条件(改性剂为7%甲醇,流速为2 mL/min,柱温为308.15 K,背压为15 M Pa)下,d4T-5’-N-磷酰化苯丙氨酸甲酯的两种非对映异构体完全达到基线分离,分离时间约15 min。     

Stereoselective Synthesis and Crystal Structure Analysis of N-Naphthyl-2-deoxy-α-D-ribopyranosylamine

A new compound N-naphthyl-2-deoxy-α-D-ribopyranosylamine was synthesized and structurally determined. It crystallizes in the orthorhombic system, space group P212121 with a = 8.361（2）, b = 12.432（3）, c = 12.791（4） A^°, Z= 4, V= 1329.6（6） A^°^3, Dc= 1.295 g/cm^3, F（000） = 552, Cl5H17NO3 and Mr= 259.30. All the active hydrogen atoms are involved in the formation of hydrogen bonds in the molecule.     

N-磷酰化氨基酸生成五配位磷中间体过程中氨基酸侧链立体化学效应的理论研究

用密度泛函(DFT)方法在B3LYP/6-311G(d,p)水平上对N-磷酰化氨基酸生成五配位磷酸羧酸混酐(IMCPA)反应中手性氨基酸残基侧链的立体化学效应进行了研究. 模拟了氨基酸残基上羧基氧原子从磷酰基的不同侧面进攻磷原子从而形成不同构型五配位磷中间体的反应途径, 探讨了IMCPA生成过程中的立体选择性.     

氨基酸和核苷的五配位磷化合物

五配位磷化合物在生物化学中起着重要作用。磷所参与的绝大多数生命化学过程,包括酶活性调节过程中蛋白质的磷酰化与去磷酰化,信息传导过程中蛋白质的磷酰化与去磷酰化,ATP的能量转移,RNA的自体切割等,其化学本质都是磷酰基转移反应。生物化学家们的研究表明,这些磷酰基转移反应都是通过五配位中间体来完成的。因此,对生物化学中五配位磷化合物的研究具有重要意义。     

Stereoselective Synthesis of α-Altropyranosyluridine Starting from Glucose

α-Nucleoside is a kind of potential antiviral and antitumor agent, and of great interest in antisense and template directed reaction. β-Altropyranosyl-nucleosides have been synthesized and the properties of their oligo-nucleotides have been studied by Eshenmoser^[1]. But it is very difficult to synthesize the α-anomer, because the direct coupling reaction leads to the β-anomer and the cyanamide route is not suitable due to the trans-configuration of 1,2-dihydroxyl groups in α-altrose. In order to resolve this problem, α-2, 1'-anhydroglucopyranosyluridine was synthesized by cyanamide route and it was hydrolyzed to title compound in good yield with 2',3'-configuration reversion.     

丝组二肽所含基团在其切割DNA反应中的作用

近 2 0年来 ,人工核酸切割试剂的研究一直是化学、生物化学和分子生物学中最为活跃的前沿领域之一[1,2 ] .人工核酸切割试剂可以在足迹技术和核酸高级结构的研究中用作高分辨率的化学探针 ,还可以用于合成定点切割试剂[3] .后者又被称为人工工具酶 ,是一种非常重要的分子生物学工具 ,在疾病的基因治疗、反义 PCR技术等领域中都具有重要的应用 .人工核酸切割试剂的切割机理主要有自由基机理和磷酸酯水解机理两大类 .相对于自由基机理 ,水解机理具有许多优点 ,使得水解型切割试剂具有更为广泛的应用 .对于 DNA,目前文献报道的水解型人工切…     

3-杂环胺基甲烯基-6-烷基(芳基)-5,6-二氢-2H-吡喃-2,4-二酮的合成及生物活性的研究

异构体;氢键;3-杂环胺基甲烯基-6-烷基(芳基)-5;6-二氢-2H-吡喃-2;4-二酮的合成及生物活性的研究