通过控制5-取代的尿嘧啶衍生物在碱催化的迈克尔型加成反应中的温度或反应时间,我们能够使用丙烯酸甲酯和丙烯腈作为受体合成N-1或N-3尿嘧啶加合物。使用1 H NMR光谱研究确定了这种化学不等价的机理。研究表明,无论所用碱类(TEA,DBU)如何,在动力学控制条件下均可形成N-1加合物。反过来,N-3加合物的合成是从最初形成的N-1,N-3二加合物通过逆迈克尔反应进行的,该反应在升高的温度或延长的反应时间中起主导作用。
Michael addition of pyrimidine derivatives with acrylates catalyzed by lipase TL IM from Thermomyces lanuginosus in a continuous-flow microreactor
作者:Li-Hua Du、Hui-Min Ling、Xi-Ping Luo
DOI:10.1039/c3ra47470d
日期:——
Lipase-catalyzed Michaeladdition of pyrimidinederivatives to acrylates in a continuous-flow microreactor is described. The influence of the structure of the Michael acceptor and the corresponding donor on the enzymatic addition was also investigated. The important features of this method include mild reaction conditions, short reaction times (30 min) and high yields.
Customizable and Regioselective One‐Pot N−H Functionalization of DNA Nucleobases to Create a Library of Nucleobase Derivatives for Biomedical Applications
作者:Djenisa H. A. Rocha、Carmen M. Machado、Vera Sousa、Cristiana F. V. Sousa、Vera L. M. Silva、Artur M. S. Silva、João Borges、João F. Mano
DOI:10.1002/ejoc.202100786
日期:2021.8.20
synthetic procedures for producing a library of nucleobasederivatives enlisted with reactive functional groups for bioconjugation and cross-linking reactions with other biomolecules are reported. The nucleobasederivatives bearing either N-alkyl, N-propanenitrile, N-allyl or N-propargyl terminals are non-cytotoxic, denoting great promise for biomedicalapplications.
Syntheses of acyclic nucleosides were achieved in water with the aid of microwave irradiation, providing a rapid, efficient and convenient method for the preparation of acyclic nucleosides in high yields.
Novel Acyclic Amide-Conjugated Nucleosides and Their Analogues
作者:Slawomir Boncel、Krzysztof Walczak
DOI:10.1080/15257770902736467
日期:2009.3.11
An effective one-step synthesis of new amide-conjugated nucleosides and their analogues, in the presence of 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride (DMT-MM) as the condensing agent, is presented. Substrate subunits carrying carboxylic group were obtained by acidic hydrolysis of Michael-type adducts of various 5-substituted uracil derivatives to methyl acrylate. Amine substrate was synthesized by reduction of 1-(2'-cyanoethyl)thymine with sodium borohydride in the presence of nickel (II) chloride as catalyst. Other applied amine substrates were 5'-amino-5'-deoxythymidine and 5-aminouracil.
Crippa, Sergio; Di Gennaro, Patrizia; Lucini, Ruggero, Gazzetta Chimica Italiana, 1993, vol. 123, # 4, p. 197 - 203
作者:Crippa, Sergio、Di Gennaro, Patrizia、Lucini, Ruggero、Orlandi, Marco、Rindone, Bruno