One-pot protocol for N-alkylation of purine, pyrimidine and azole derivatives via alcohols using Ph 3 P/I 2 : simple route for carboacyclic nucleoside synthesis
作者:Mohammad Navid Soltani Rad、Faezeh Soleimani
DOI:10.1016/j.tet.2016.06.069
日期:2016.8
efficient synthetic protocol for the one-pot N-alkylation of nucleobases and their related N-heterocycles via alcohols utilizing the combination of PPh3 and I2 is reported. In this protocol purine, pyrimidine and azole derivatives underwent the N-alkylation reaction with diverse primaryalcohols using Ph3P/I2 in the presence of Et3N-K2CO3 in anhydrous DMF to give the N-alkyl adducts (carboacyclic nucleosides)
据报道,利用PPh 3和I 2的组合,通过醇进行一锅N-烷基化核碱基及其相关的N-杂环的简单有效的合成方案。在这个协议中嘌呤,嘧啶和吡咯衍生物经历与使用pH不同的伯醇的N-烷基化反应3 P / I 2的Et的存在3 N-K 2 CO 3在无水DMF,得到Ñ-烷基加合物(碳环核苷)的收率很高(高达90%)。讨论了该反应中一些参数的影响,包括溶剂类型,碱,试剂和温度。此外,该方案已证明对二醇中伯羟基相对于仲羟基具有良好的选择性。
One-Pot Synthesis of N-Alkyl Purine, Pyrimidine and Azole Derivatives from Alcohols using Ph3P/CCl4: A Rapid Route to Carboacyclic Nucleoside Synthesis
A facile and efficient method for one-pot N-alkylation of nucleobases and azole derivatives from alcohols using triphenylphosphine in carbon tetrachloride is described. In this method, treatment of alcohols with a mixture of triphenylphosphine, carbon tetrachloride, nucleobase or azole derivatives and potassium carbonate in the presence of catalytic amounts of tetra-n-butylammonium iodide (TBAI) in
Triphenylphosphine-free approach for one-pot N-alkylation of purine, pyrimidine, and azole derivatives with alcohols using P2O5/KI: A facile and selective route to access carboacyclic nucleosides
A facile, selective, and mild synthetic approach for one-pot N-alkylation of nucleobases and other related N-heterocycles via alcohols, using a mixture of P2O5 and KI is described. The reaction of structurally diverse purines, pyrimidines, and/or azoles with primaryalcohols with the use of P2O5/KI and basic mixture of Et3N/K2CO3 in refluxing DMF affords the corresponding N-alkyl derivatives (carboacyclic
描述了一种使用P 2 O 5和KI的混合物通过醇通过一锅法对核碱基和其他相关N-杂环进行N-烷基化的简便,选择性和温和的合成方法。使用P 2 O 5 / KI和Et 3 N / K 2 CO 3的碱性混合物,使结构不同的嘌呤,嘧啶和/或唑与伯醇反应在回流中,DMF以良好至合理的产率得到相应的N-烷基衍生物(碳环核苷)。评估了包括溶剂,碱,温度和底物/试剂比率的不同参数对反应进程的影响。仲和叔醇不能与核碱基反应。当前方案的主要优点是形成水溶性副产物,其中提供了简单的后处理和纯化过程。
Chitosan–silica sulfate nanohybrid: a highly efficient and green heterogeneous nanocatalyst for the regioselective synthesis of N-alkyl purine, pyrimidine and related N-heterocycles via presilylated method
pyrimidine nucleobases as well as other related N-heterocycles with HMDS utilizing chitosan–silica sulfate nanohybrid (CSSNH) is described. CSSNH is proved to be a useful, highly efficient and eco-friendly heterogeneous nanohybrid catalyst for silylation of nucleobases. The presilylated nucleobases then underwent the reaction with different sources of carbon electrophiles to afford the desired N-alkyl-substituted
Regio- and Enantioselective <i>N</i>-Allylations of Imidazole, Benzimidazole, and Purine Heterocycles Catalyzed by Single-Component Metallacyclic Iridium Complexes
作者:Levi M. Stanley、John F. Hartwig
DOI:10.1021/ja902243s
日期:2009.7.1
Kinetic studies on the allylation of benzimidazole catalyzed by metallacyclic iridium-phosphoramidite complexes, in combination with studies on the deactivation of these catalysts in the presence of heterocyclic nucleophiles, provide insight into the effects of the structures of the phosphoramidite ligands on the stability of the metallacyclic catalysts. The data obtained from these studies have led to