使用Ph 3 P / I 2通过醇进行嘌呤,嘧啶和唑衍生物的N-烷基化的一锅操作方案:碳环核苷合成的简单途径
摘要:
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。
Highly efficient protocol for one-pot N-alkylation of nucleobases using alcohol in ionic liquid media as a straightforward route to access acyclic nucleoside was described. In this protocol purine, pyrimidine as well as azole derivatives underwent the N-alkylation reaction with primary or secondary alcohols using TsCl/TEA/K2CO3 in bmim[Br] to afford the products in good-to-excellent yields. The influence of factors in this method including the type of ionic liquid, base and sulfonating agents was discussed. The current method showed an appropriate selectivity in reaction with primary alcohols in comparison with secondary alcohols. This protocol is mild, safe and easy to apply; moreover, it is quite compatible with eco-friendly and green chemistry protocols, since the exploitation of toxic and hazardous materials such as DMF and alkyl halides has been prevented.
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
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。