π-Expanded Coumarins: One-Pot Photo Synthesis of 5<i>H</i>-Benzo[12,1]tetrapheno[7,6,5-<i>cde</i>]chromen-5-ones and Photophysical Properties
作者:Wenhao Xue、Ding Wang、Chenyu Li、Zheng Zhai、Tao Wang、Yong Liang、Zunting Zhang
DOI:10.1021/acs.joc.9b03327
日期:2020.3.6
The synthesis of a unique type of it-expanded coumarin derivatives, bearing six fused phenyl rings, was achieved via one-pot Suzuki reaction and visible light-driven electrocyclization. The large it-expanded 5H-benzo[12,1]tetrapheno[7,6,5]chromen-5-ones were obtained in good to high yields from 1-bromo-2H-phenaleno[1,2,3-de]chromen-2-ones, and the intriguing optical properties were explored by altering the attached functional groups. 2-Arylaminosubstituted-5H-benzo[12,1]tetrapheno[7,6,5-cddchromen-5-ones showed a large Stokes shift (4005 cm(-1)) or excellent fluorescence quantum yield (Phi(f) = 0.75) along with significant bathochromic shift in tetrahydrofuran.