An expedient approach involving BF3˙OEt2-catalyzed aza-Claisen rearrangement and palladium-catalyzed intramolecular Heck reaction for the synthesis of pyrimidine-fused azocine derivatives is described. The mechanistic interpretation of the plausible mode of cyclization is also described. uracil - aza-Claisen rearrangement - azocine - Heck reaction
Concise Access to Pyrimidine-Annulated Azepine and Azocine Derivatives by Ruthenium-Catalyzed Ring-Closing Metathesis
作者:K. Majumdar、Shovan Mondal、Debankan Ghosh
DOI:10.1055/s-0029-1219228
日期:2010.4
systems are commonly undertaken throughcyclization and cycloaddition reactions, but the formation of seven- and eight-membered-ring systems are not as abundant. An efficient and high-yielding method for the synthesis of seven- and eight-membered-ring nitrogen-containing heterocycles by ring-closingmetathesis is reported. uracil - azepine - azocine - ring-closingmetathesis
An easy access to pyrimidine-fused azocine derivatives by thiophenol-mediated radical cyclization via 8-endo-trig mode
作者:K.C. Majumdar、Shovan Mondal、Debankan Ghosh
DOI:10.1016/j.tetlet.2009.11.020
日期:2010.1
An efficient route for the synthesis of eight-membered nitrogen heterocycles has been developed via a thiophenol-mediated intramolecular 8-endo-trig radical cyclization. The radical precursors were prepared using BF3·Et2O-catalyzed aza-Claisenrearrangement followed by the reaction with propargyl bromide. The alkenyl radicals are generated from thiophenol initiated by the benzoyl peroxide instead of
An expedient approach for the regioselective synthesis of novel 1,5,6,7-tetrahydro-2H-pyrrolo[3,2-d]pyrimidine-2,4(3H,5H)-dione derivatives via Fe (III)-mediated iodocyclization
作者:Subhadeep Samanta、Shovan Mondal
DOI:10.1016/j.tetlet.2022.154223
日期:2022.12
Novel pyrrolo[3,2-d]pyrimidine derivatives have been synthesized by an efficient and regioselective Fe (III)-mediated iodocyclization method starting from a commercially available uracil compound. Here, iron has a dual role in the iodocyclization process by acting as a Lewis acid which promotes the release of I+ cation from iodine by removing iodide ion, and also as an oxidant which again generates
新型吡咯并 [3,2- d ] 嘧啶衍生物已通过有效且区域选择性的 Fe (III) 介导的碘环化方法从市售尿嘧啶化合物开始合成。在此,铁在碘环化过程中具有双重作用,既作为路易斯酸通过去除碘离子促进碘释放 I +阳离子,又作为氧化剂从碘离子再次生成碘参与催化反应循环。