An environmentallyfriendly one-pot synthesis of 2-arylbenzofurans under ambient temperature has been developed. It features an ortho-hydroxyl group assisted Wittig reaction of substituted salicylaldehyde followed by an in situ oxidative cyclization. Its advantages include readily available and non-hazardous materials, benign reaction conditions (room temperature, green solvent and one-pot manner), easy work-up and high overall yields. Utilizing this methodology, various 2-aryl-benzofurans including four natural products have been synthesized.
A Concise Synthesis of Natural Benzofuran Neolignans and Analogues
作者:Xin-Fang Duan、Gang Shen、Zhan-Bin Zhang
DOI:10.1055/s-0029-1218826
日期:2010.8
of four naturally occurring benzofuran neolignans and two analogues was achieved in four steps in 44-51% overall yield. Key steps involved a two-step construction of benzofuran nucleus and a Suzuki coupling. This synthesis has been proven straightforward and efficient, and more related analogues can be prepared for structure-activity relationship explorations. benzofuran - neolignan - McMurry reaction