Synthesis of π-conjugated asymmetric aza-BODIPYs via nitrosobicyclopyrroles
作者:Ryota Mori、Minenari Asakura、Yukinori Kobayashi、Hiromu Mashimo、Makoto Roppongi、Satoshi Ito
DOI:10.1016/j.tetlet.2022.153759
日期:2022.4
π-Conjugated aza-BODIPYs with absorption in the near-infrared region have attracted attention, but there are few reports of their synthesis. We report the synthesis and absorption properties of π-conjugated asymmetricaza-BODIPYs by nitrosation and retro-Diels-Alder reaction of bicyclo[2.2.2]octadiene-fused bicyclopyrroles. We also synthesized aza-BODIPY fused with [2.3]naphtho and [2.3]anthra structures
Dipyrrolyldiketone difluoroboron complexes (BONEPYs) were synthesized by condensation of the corresponding pyrroles and malonyl chloride followed by treatment with BF3·OEt2. The aryl-substituted pyrrole is introduced to form a cyclic system in order to investigate anion binding studies. In BONEPYs 1–3 the o-H of the aryl group forms hydrogenbonding with F− to give a more table complex. In contrast, the intramolecular