Rhodium(II)-Catalyzed Annulation of Azavinyl Carbenes Through Ring-Expansion of 1,3,5-Trioxane: Rapid Access to Nine-Membered 1,3,5,7-Trioxazonines
作者:Jola Pospech、Raffaella Ferraccioli、Helfried Neumann、Matthias Beller
DOI:10.1002/asia.201500493
日期:2015.12
The rhodium(II)‐catalyzed denitrogenative coupling of N‐alkylsulfonyl 1,2,3‐triazoles with 1,3,5‐trioxane led to nine‐membered‐ringed trioxazonines in moderate‐to‐good yields. 1,3,5‐Trioxane, acting as an oxygen nucleophile, reacted with the α‐aza‐vinylcarbene intermediate, giving rise to ylide formation, which was probably the key step in the reaction. Triazoles that contained aryl substituents with
N-烷基磺酰基1,2,3-三唑与1,3,5-三恶烷的铑(II)催化的脱氮偶合以中等至良好的产率产生了九元环的三恶嗪。1,3,5-三恶烷,作为氧亲核试剂,与α-氮杂-乙烯基卡宾中间体反应,形成内酯,这可能是反应的关键步骤。含有在C4碳原子上具有各种电子和空间特征的芳基取代基的三唑具有良好的耐受性。Trioxazonine衍生物的合成是通过1-Meylazide和末端炔烃的一锅,两步过程,结合Cu I催化的1,3-偶极环加成反应和Rh催化的转化反应而完成的。