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.
Antibodies to cytokinins having a glycosylated isoprenoid side chain and
申请人:The United States of America as represented by the Secretary of
公开号:US05210077A1
公开(公告)日:1993-05-11
Antibodies (polyclonal and monoclonal) having specificity for cytokinins having a glycosylated isoprenoid side chain are described. The antibodies simultaneously recognize a purine ring, an isoprenoid side chain, and a 4'-O-glycoside. The antibodies were elicited using a novel hapten, 9-(2-carboxyethyl) cytokinin-O-glycoside. Immunoassay methods for the determination of cytokinins having a glycosylated isoprenoid side chain which utilize the antibodies are also described.
Symmetrical and unsymmetrical <i>α</i>,<i>ω</i>-nucleobase amide-conjugated systems
作者:Sławomir Boncel、Maciej Mączka、Krzysztof K K Koziol、Radosław Motyka、Krzysztof Z Walczak
DOI:10.3762/bjoc.6.34
日期:——
uracils or N-9 Michael adducts of 6-chloropurine with methyl acrylate. The amines used were aliphatic/aromatic diamines, adenine, 5-substituted 1-(omega-aminoalkyl)uracils and 5'-amino-2',5'-dideoxythymidine. The title compounds may find application as antiprotozoal agents. Moreover, preliminary microscopy TEM studies of supramolecular behaviour showed that target molecules with bolaamphiphilic structures
我们介绍了几种新型对称和不对称 α、ω-核碱基单-和双-酰胺共轭系统的合成和选定的物理化学性质,这些系统包含脂肪族、芳香族或糖类键。合成的最后阶段涉及带有羧基的亚单元与胺亚单元的缩合。发现 4-(4,6-二甲氧基-1,3,5-三嗪-2-基)-4-甲基吗啉氯化物 (DMT-MM) 是一种特别有效的缩合剂。含有羧基的亚基通过尿嘧啶的N-1迈克尔加合物或6-氯嘌呤的N-9迈克尔加合物与丙烯酸甲酯的酸水解获得。使用的胺是脂肪族/芳香族二胺、腺嘌呤、5-取代的1-(ω-氨基烷基)尿嘧啶和5'-氨基-2',5'-二脱氧胸苷。标题化合物可用作抗原生动物剂。此外,超分子行为的初步显微镜 TEM 研究表明,具有双亲结构的目标分子能够形成高度有序的组件,主要是纳米纤维。
Promiscuous enzyme-catalyzed regioselective Michael addition of purine derivatives to α,β-unsaturated carbonyl compounds in organic solvent
作者:Jun-Liang Wang、Jian-Ming Xu、Qi Wu、De-Shui Lv、Xian-Fu Lin
DOI:10.1016/j.tet.2009.01.056
日期:2009.3
Michael addition of purine derivatives to α,β-unsaturatedcarbonylcompounds could be catalyzed by d-aminoacylase amano (DA) in DMSO. The influence of reaction conditions on the Michael addition, including solvent, temperature, and enzyme concentration was systematically investigated. Then we extended this methodology to six structurally diverse purine derivatives and a variety of α,β-unsaturated carbonyl