α-Hydroxy carbon radicals generated from alcohols by the action of NHPI smoothly added to electron-deficient alkynes like acetylenedicarboxylates. For instance, the reaction of 2-propanol with dimethyl acetylenedicarboxylate afforded maleate derivative 3, 3-methoxycarbonyl-4,4-dimethyl-2-buten-4-olide (4), and a fused bis-γ-butyrolactone 5 formed by further addition of 2-hydroxy-2-propyl radical to 4.
由
酒精在NH
PI作用下生成的α-羟基碳自由基平稳地与缺电子的
炔烃(如二
羧酸乙炔酯)发生加成反应。例如,2-
丙醇与二甲基
乙炔二
羧酸酯的反应生成了
马来酸酯衍
生物3,以及通过将2-羟基-2-丙基自由基进一步加成到4而形成的融合双-
γ-丁内酯5。