Four coumarins (1-4) were synthesized by routes shown in Charts 2-5, respectively. A proposed structure for a new coumarin isolated from Artemisia carviforia was incorrect, and the structure of coumarin should be represented by formula (3).
四种
香豆素(1-4)的合成路线分别如图 2-5 所示。从蒿属植物中分离出的一种新的
香豆素的拟议结构不正确,
香豆素的结构应由式(3)表示。