Lewis acid (FeCl3) mediated dual bond (C–C and C–O) formation for synthesis of 3,4-dihydrocoumarins is presented. This method has successfully delivered a number of dihydrocoumarins containing dense functionalities on the aromatic ring. Significantly, the present method enabled achieving dihydrocoumarins with tertiary as well as quaternary carbon atoms at the benzylic position. Gratifyingly, the novel spiro-tetracyclic lactones have also been dextrously prepared using this process.
介绍了一种以
路易斯酸(FeCl3)为媒介的双键(C–C 和 C–O)形成方法,用于合成3,4-二氢
香豆素。这种方法成功地合成了多种在芳香环上含有密集功能团的二氢
香豆素。值得注意的是,这种方法能够实现含有三级和四级碳原子的苯乙基位置的二氢
香豆素。此外,采用此工艺还巧妙地制备了新型的螺环四环内酯。