作者:Yong Jiang、Botao Gao、Wenjuan Huang、Yongmin Liang、Guosheng Huang、Yongxiang Ma
DOI:10.1080/00397910701860323
日期:2008.12.31
convenient, and efficient one-pot method for the preparation of benzofuran is reported. Sonogashira coupling reaction of aryl iodides with 2-methyl-3-butyn-2-ol was used as an acetylene source in the presence of Pd(PPh3)2Cl2 and CuI. Deprotection of the acetylene moiety in the same pot using a strong base and the second Sonogashira coupling/cyclization of and substituted o-iodophenols led to the formation
摘要 报道了一种简单、方便、高效的一锅法制备苯并呋喃。在 Pd(PPh3)2Cl2 和 CuI 存在下,芳基碘化物与 2-methyl-3-butyn-2-ol 的 Sonogashira 偶联反应用作乙炔源。在同一锅中使用强碱对乙炔部分进行脱保护,并与取代的邻碘苯酚进行第二次 Sonogashira 偶联/环化,导致形成适当的苯并 [b] 呋喃。这些协议也可用于合成天然产物和吲哚。