A novel and rapid assembly of an interesting class of furocoumarins-4H-furo[3,2-c]chromen-4-ones has been successfully achieved using one-pot sequential coupling/cyclization strategy with easily available starting materials 3-bromo-4-acetoxycoumarins and terminal alkynes. The key synthesis involves Pd/Cu-catalyzed alkynylation with in situ prepared dialkynylzincs followed by intramolecular hydroalkoxylation.
利用易于获得的起始原料 3-bromo-4-acetoxycoumarins 和末端
炔烃,采用单锅顺序偶联/环化策略,成功地快速合成了一类有趣的
呋喃香豆素-4H-
呋喃并[3,2-c]色烯-4-酮。关键的合成过程包括在 Pd/Cu 催化下与原位制备的二炔嗪发生炔化反应,然后进行分子内的氢烷氧基化反应。