Synthesis of Polycyclic Heteroaromatic Coumarins via Photoinduced Dehydrogenative Annulation of 4-Phenyl-3-heteroarylcoumarins
作者:Juan Shi、Yang Kang、Tao Wang、Yong Liang、Zunting Zhang
DOI:10.1021/acs.joc.8b02290
日期:2018.11.16
An efficient, oxidant and metal-free synthesis of polycyclic heteroaromatic coumarins was developed. H-Furo[2′,3′:3,4]naphtho[2,1-c]chromen-4-one (2a–2f), 1H-benzofuro[2′,3′:3,4]naphtho[2,1-c]chromen-1-one (2g–2j), and 4H-thieno[2′,3′:3,4]naphtho[2,1-c]chromen-4-one (2k–2s) derivatives were obtained by the irradiation of 4-phenyl-3-heteroarylcoumarin in EtOH–H2O (9:1, v/v) using a high-pressure Hg
开发了一种高效,无氧化剂且无金属的多环杂芳香豆素合成方法。H-Furo [2',3':3,4]萘[2,1-c] chromen-4-one(2a – 2f),1H-苯并呋喃[2',3':3,4] naphtho [2 ,1-c] chromen-1-one(2g – 2j)和4H-thieno [2',3':3,4] naphtho [2,1-c] chromen-4-one(2k – 2s)衍生物在室温和Ar气氛下,使用高压汞灯作为光源,通过在EtOH-H 2 O(9:1,v / v)中对4-苯基-3-杂芳基香豆素进行辐照获得。由于π-共轭体系的扩展,在乙醇溶液中2a - 2s表现出强烈的荧光发射(ΦF = 0.40–0.83)。