@article{06330de1748245b090351d2f5f064a8e,
title = "Synthesis of 1H-2-Benzopyran-5,8-dione Skeleton through a Cascade Reaction between Benzoquinone and β-Ketoester",
abstract = "The 1H-2-benzopyran-5,8-dione structure was synthesized by a cascade reaction through Michael addition, elimination of HBr, and O-alkylation between a dibromobenzoquinone derivative and β-ketoesters under basic conditions. The reaction using potassium carbonate and 18-crown-6 in THF was the best condition, giving 1H-2-benzopyran-5,8-dione derivatives in good yields. The UV-vis absorption spectrum and cyclic voltammogram of the synthesized 1H-2-benzopyran-5,8-dione derivative were measured, clarifying the photophysical and redox properties.",
keywords = "1H-2-Benzopyran-5,8-dione, Cascade reaction, Physical property",
author = "Masataka Nakahara and Hiroyoshi Ohtsu and Masaki Kawano and Kengo Hanaya and Takeshi Sugai and Shuhei Higashibayashi",
note = "Funding Information: This work was supported by JSPS KAKENHI Grant Number JP20K05499 (S.H.), JP20H04662 (M.K.), and Fukuoka Naohiko Memorial Foundation (S.H.). The X-ray crystallographic analysis was performed under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2021G046). The computations were performed at the Research Center for Computational Science, Okazaki, Japan. Publisher Copyright: {\textcopyright} 2022 The Chemical Society of Japan",
year = "2022",
month = apr,
doi = "10.1246/cl.210817",
language = "English",
volume = "51",
pages = "356--359",
journal = "Chemistry Letters",
issn = "0366-7022",
publisher = "Chemical Society of Japan",
number = "4",
}