Treatment of a range of sp3-, sp2- and sp-nucleophiles with N-formyl carbazole leads to the formation of the metastable anionic carbazole carbinols. In the presence of a second nucleophilic reagent such as phosphonoacetate or an organolithium, these collapse on warming to the aldehyde which is trapped in situ to afford the α,β-unsaturated esters or secondary carbinols respectively.
通过N-甲酰
咔唑与一系列sp3-、sp2-和sp-亲核试剂反应,形成了亚稳态阴离子
咔唑醇。在存在另一种亲核试剂(如膦酰
乙酸酯或
有机锂试剂)的情况下,通过加热使这些产物转化为醛,并原位捕获得到α,β-不饱和
酯或二级醇。