Synthesis of novel benzopyrano[3,2-c]coumarins via tandem base promoted nucleophilic substitution and intramolecular electrophilic aromatic cyclization
Efficient and facile synthesis of 7H-benzopyrano[3,2-c]coumarins has been achieved by mild base promoted reaction of 4-chloro-3-formylcoumarin with diversely functionalized resorcinols. All the products were obtained as pure precipitates from the reaction mixture and the structure of the product was confirmed by X-ray analysis.
通过4-氯-3-甲酰基香豆素与各种官能化间苯二酚的轻度碱促进反应,已经实现了7 H-苯并吡喃并[3,2- c ]香豆素的高效合成。从反应混合物中以纯沉淀形式获得所有产物,并通过X射线分析证实了产物的结构。