Abstract
AbstractNew synthetic method of coumarins 3‐aldehyde via visible light stimulation and oxidation promotion cascade radical cyclization/hydrolysis process is reported. this reaction involves a two‐step procedure, the 1,3‐dioxolane radical is initiated in situ from 1,3‐dioxolane via the excited Ru(bpy)3Cl2 and oxidant TBHP, subsequently an addition to triple bond of various alkynes produces vinyl radicals, the radical intermediates can smoothly convert to coumarin 3‐aldehyde via tandem cyclization/acidic hydrolysis process in good to excellent yields. Furthermore, the synthetic application valuable of coumarin 3‐aldehyde is also evaluated in this work.
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