カサシマ　ヨシオ   YOSHIO KASASHIMA   笠嶋　義夫    所属   千葉工業大学  創造工学部 教育センター（創造工学部）    職種   教授
言語種別	英語
発行・発表の年月	2019/06
形態種別	学術雑誌
査読	査読あり
標題	A new class of flavonoids bearing macrocyclic polyethers by stereoselective photochemical cycloaddition reaction
執筆形態	共著
掲載誌名	Tetrahedron
掲載区分	国外
出版社・発行元	Elsevier Ltd.
巻・号・頁	75(29),pp.3911-3916
著者・共著者	Hiroki Ishikawa, Naohiro Uemura, Ryo Taira, Kento Sano, Yasushi Yoshida,Takashi Mino, Yoshio Kasashima, Masami Sakamoto
概要	A new class of flavonoids bearing cyclic polyethers involving a phenyl ring was conveniently provided by the intramolecular photochemical dimerization of 2-chromonecarboxylic esters. Irradiation of 2- chromonecarboxylate with a polyether tethered at both ends promoted intramolecular [2 þ 2] cyclobutane formation leading to 14- to 27-membered cyclic polyethers. The efficiency depended on the substituted position of the phenyl ring, with ortho- and meta-substituted derivatives giving cycloadducts in good chemical yields and quantum efficiencies, whereas the para-derivatives were inert toward photolysis.
ISSN	0040-4020