Reactions of 2-hydroxybenzaldehydes and 2-hydroxy-1-naphthaldehydes with various activated alkenes under Baylis–Hillman conditions have been shown to proceed with regioselective cyclisation to afford the corresponding 3-substituted chromene derivatives. In some cases competitive dimerisation of the alkene component was observed, and direct dimerisation in the absence of the aldehyde has been explored.
在Baylis-Hillman条件下,2-羟基
苯甲醛和
2-羟基-1-萘甲醛与多种活化烯烃反应,显示出区域选择性的环化,生成相应的3-取代色烯衍
生物。在某些情况下,观察到烯烃组分的竞争性二聚作用,并且在没有醛的情况下直接二聚也已被探索。