An Unexpected Highly Stereoselective Bisaziridination of (<i>E</i>,<i>E</i>)-1,4-Dialkyl-2,3-dinitrobutadienes Followed by a Nitro Group Driven Ring Enlargement
作者:Alessia Ciogli、Stefania Fioravanti、Francesco Gasparrini、Lucio Pellacani、Egon Rizzato、Domenico Spinelli、Paolo A. Tardella
DOI:10.1021/jo902112j
日期:2009.12.18
(+/-)-2,2'-Dinitro-2,2'-biaziridines were obtained by a direct aza-MIRC (Michael initiated ring closure) reaction on (E,E)-1,4-dialkyl-2,3-dinitro-1,3-butadienes under very mild conditions. The reactions occur with high stereoselectivity as shown by the enantioselective HPLC analyses performed on the crude mixtures. Ring enlargement to 3,3'-bi(1,2,4-oxadiazole) derivatives was easily obtained by a simple treatment with sodium iodide in DMSO, with an unforeseen regioselective aziridine C-C cleavage.
(±)-2,2'-二硝基-2,2'-双氮杂环丙烷通过直接的aza-MIRC(迈克尔环闭)反应,从(E,E)-1,4-二烷基-2,3-二硝基-1,3-丁二烯在非常温和的条件下获得。反应以高立体选择性进行,通过对粗混合物进行对映体选择性的高效液相色谱分析得以证实。通过在二甲基亚砜中简单地用碘化钠处理,可以轻松实现环扩大,生成3,3'-双(1,2,4-噁二唑)衍生物,同时伴随着意外的氮杂环丙烷C-C键区域选择性断裂。