Photolytic amino etherification reactions of aryl diazoacetates with N-heterocycles and a stoichiometric amount of dioxane/tetrahydropyran in aqueous medium: synthesis of 1,4-dioxepane/1,4,7-dioxazonan-6-one systems
作者:Debajit Maiti、Ranajit Das、Subhabrata Sen
DOI:10.1039/d1gc02797b
日期:——
reaction, various aryl diazoacetates were converted to oxonium ylides by reacting with 1,4-dioxane and THP. These ylides generated in aqueous medium (under metal- and base-free conditions) were then used for the amino etherification of the aforementioned heterocycles in excellent yield. The ylides underwent a [1,2] shift to afford substituted 1,4-dioxepanes. Phthalimide products were also converted
在此,我们报道了重氮乙酸芳基酯与化学计量量的 1,4-二恶烷/四氢吡喃 (THP) 和各种杂环如吲哚、吡咯、邻苯二甲酰亚胺、噻唑烷二酮和乙内酰脲在水中的蓝色 LED 介导反应。在反应过程中,各种重氮乙酸芳基酯通过与 1,4-二恶烷和 THP 反应转化为氧鎓叶立德。这些在水性介质中(在无金属和无碱条件下)产生的叶立德然后以优异的收率用于上述杂环的氨基醚化。叶立德经历了 [1,2] 转变以提供取代的 1,4-二氧杂环己烷。邻苯二甲酰亚胺产品也被转化为 1,4,7-dioxazonan-6-ones。反应动力学、哈米特图和 DFT 计算(溶剂相)使叶立德的形成和随后与亲核试剂的反应合理化。该反应也以多克规模进行了证明。这种重氮乙酸芳基酯在水性介质中的氨基醚化反应证明了将有毒的 1,4-二恶烷转化为杂环官能化的可持续过程。