Studies on heterocyclic compounds. VII. Syntheses of novel furo[2, 3-<i>b</i>]chromones
作者:Sheng-Chu Kuo、Jiin-Sheng Wu、Li-Jiau Huang、Chun-Hsiung Wu、Shun-Chueh Huang、Teh-Chang Chou
DOI:10.1002/jhet.5570260317
日期:1989.5
Furo[2, 3-b]chromone (1a) was conveniently prepared by the PPE-promoted cyclization of 5-(2′-carboxy-phenoxy)furan-2-carboxylic acid (8) which was made from methyl salicylate and ethyl 5-nitrofuran-2-carboxyl-ate. Furo[2, 3-b]chromon-2-acrylic acid (13) was obtained by a similar cyclization. Direct acylation of 1a afforded 2-acetylfuro[2, 3-b]chromone (10). Several derivatives of furo[2, 3-b]chromone
可通过PPE促进由水杨酸甲酯和乙基5制成的5-(2'-羧基-苯氧基)呋喃-2-羧酸(8)的环化反应,方便地制备Furo [2,3- b ]色酮(1a)。-硝基呋喃-2-羧酸酯。通过类似的环化反应获得呋喃[2,3 - b ]发色-2-丙烯酸(13)。1a的直接酰化得到2-乙酰基呋喃[2,3- b ]色酮(10)。发现呋喃[2,3- b ]色酮的几种衍生物在大鼠被动皮肤过敏反应(PGA)测试中显示抗过敏活性。