didehydroisobenzofuran, a new heteroaryne species, was developed by bromine/lithium exchange of the dibromoisobenzofuran. The reactive intermediate, thus generated, was trapped by appropriate arynophile to give the [2+2], [2+3], and [2+4] cycloadducts, respectively. Moreover, the reaction could be applied to the syntheses of isoanthracenofurans (anthra[2,3‐c]furans), a new class of heteroacenes, with
通过二溴异苯并呋喃的溴/锂交换,开发了一种新型杂芳烃二氢异苯并呋喃的有效生成方法。如此产生的反应性中间体被适当的亲嗜嗜碱剂捕获,分别得到[2 + 2],[2 + 3]和[2 + 4]环加合物。此外,该反应可以应用于异蒽酮(蒽[2,3- c ]呋喃)的合成,这是一类新的杂芳烃,具有与相应甲cen烯(蒽[2,3- b ]呋喃)等电的电子结构。
An efficient synthetic route to 1,3-bis(arylethynyl)isobenzofuran using alkoxybenzocyclobutenone as a reactive platform
An efficient synthetic method of 1,3-bis(arylethynyl)isobenzofurans is developed. Nucleophilic addition of alkynyllithium to benzocyclobutenone and subsequent oxidative ring cleavage of the four-membered ring gave a keto-aldehyde, which, in turn, accepted the second nucleophile to produce isobenzofurans after acid treatment.
efficient synthetic route to 5,6,11,12‐tetrakis(arylethynyl)tetracenes, new π‐extended rubrene derivatives, was developed by means of [2+4] cycloaddition of dialkynylnaphthalyne and dialkynylisobenzofuran. Importantly, two alkynyl groups introduced into the aryne exerts a significant effect in lowering the LUMO energy, allowing practical access to sterically overcrowded polycyclic structures through an efficient
A new syntheticroute to 5,6,11,12-tetrakis(arylethynyl)tetracenes, π-extended rubrenes, was developed via [4 + 2] cycloadditions of dialkynylisobenzofuran and 1,4-naphthoquinone. Introduction of arylethynyl groups by double nucleophilic additions to tetracenequinone gave sterically congested (arylethynyl)tetracenes after reductive aromatization. The photophysical properties of the newly prepared π-conjugated
Intramolecular benzoallene–alkyne cycloaddition initiated by site-selective S<sub>N</sub>2′ reaction of epoxytetracene en route to π-extended pyracylene
A hydrogen halide promoted cascade reaction of epoxytetracene to afford halo-benzoindenotetracene including a benzoallene intermediate was developed. The remaining two alkynyl groups in benzoindenotetracene were further reacted with norbornadiene or arylamine through transition metal-catalyzed cyclization to give π-extended pyracylene derivatives.