Strain‐Promoted Double Azide Addition to Octadehydrodibenzo[12]annulene Derivatives
作者:Satomi Fukushima、Minoru Ashizawa、Susumu Kawauchi、Tsuyoshi Michinobu
DOI:10.1002/hlca.201900016
日期:2019.4
Octadehydrodibenzo[12]annulenes (DBAs), readily available by the oxidative acetylenic coupling of 1,2‐diethynylbenzene derivatives, were reacted with organic azides. As compared to the well‐known strain‐promoted azide‐alkyne cycloaddition (SpAAC) of 5,6,11,12‐tetradehydrodibenzo[a,e][8]annulene, the reactivity of the DBA alkynes was lower due to the lower strain energy. However, the regioselective
1,2-二乙炔基苯衍生物的氧化炔键可轻易获得的十八氢二苯并[12]环戊烯(DBA)与有机叠氮化物反应。与众所周知的应变促进的叠氮化物-炔烃环加成(SpAAC)5,6,11,12-四氢二苯并[ a,e ] [8]环戊烯相比,由于应变较低,DBA炔烃的反应性较低能源。但是,在温和条件下,区域选择性双叠氮化物的添加没有任何副反应,产生了双三唑产物。通过X射线晶体结构分析确认了产物的结构,并通过1研究了反应机理。H-NMR光谱和计算研究。还发现DBA几乎不发荧光,而双三唑产品显示绿色荧光,量子产率高达5.1%。最后,将新的应变促进型双叠氮化物添加到DBA中用于逐步生长聚合,成功生产了高分子量三唑聚合物。