Regioselective and Enantiospecific Synthesis of Dioxepines by (Cyclopentadienyl)ruthenium-Catalyzed Condensations of Diazocarbonyls and Oxetanes
作者:Léo Egger、Laure Guénée、Thomas Bürgi、Jérôme Lacour
DOI:10.1002/adsc.201700638
日期:2017.9.4
catalytic combination of the (cyclopentadienyl)ruthenium complex [CpRu(CH3CN)3][BArF] and 1,10-phenanthroline. The regioselective [4+3] insertions follow an SN1-like mechanism and occur yet enantiospecifically (es 74%). The retention of configuration was ascertained by vibrational circular dichroism (VCD) and solid state analyses. Furans, products of [4+1] insertions, are only observed as traces in
1,4-二氧杂环丁烷是由(环戊二烯基)钌配合物[CpRu(CH 3 CN)3 ] [BAr F ]和1, 10-菲咯啉。区域选择性的[4 + 3]插入遵循S N 1样机制,并且对映体发生(es 74%)。构型的保留通过振动圆二色性(VCD)和固态分析确定。呋喃,[4 + 1]插入的产物,在上述方案中仅作为痕量观察到。为了促进它们在CpRu催化下的形成,有必要使用以γ-卤代醇为底物的两步法。