Intramolecular [2+2+2] cycloaddition of bis(propargylphenyl)carbodiimides: synthesis of L-shaped π-extended compounds with pyrrolo[1,2-a][1,8]naphthyridine corner units
L-shaped Ï-extended penta-, hexa-, and heptacycles with a pyrrolo[1,2-a][1,8]naphthyridine junction were prepared from N,Nâ²-bis[2-(2-alkyn-1-yl)phenyl]carbodiimides or their naphthyl analogs via Rh(I)-catalyzed intramolecular [2+2+2] cycloaddition and dehydrogenative aromatization. These L-shaped compounds emit sky-blue, yellow-green, or golden-orange fluorescence, with high quantum yields.
8]naphthyridine and its derivatives were synthesized using two methods: fully intramolecular [2 + 2 + 2] cycloaddition and oxidative aromatization using substituted carbodiimide and modification of an electron-rich indole ring of an L-shaped skeleton via electrophilic reaction and cross-coupling. These L-shaped compounds emitted fluorescence in high quantum yield. The position of substituents affected
用两种方法合成L形,π扩展的五环二苯并吡咯并[1,2- a ] [1,8]萘啶及其衍生物:分子内完全[2 + 2 + 2]环加成反应和使用取代的碳二亚胺进行氧化芳构化和修饰亲电反应和交叉偶联作用制备L型骨架的富电子吲哚环 这些L形化合物以高量子产率发射荧光。取代基的位置通过π共轭和骨架畸变这两种不同的机制影响荧光颜色,这导致被取代的L形化合物发出各种颜色的荧光,并表现出溶剂化荧光变色。