New access to carbonyl ylides by the silicon-based 1,3-elimination and their [3 + 2] cycloadditions to activated alkenes and alkynes: One-step synthesis of dihydrofurans and tetrahydrofurans
Simple aryl-substituted carbonylylides are generated by the silicon-based 1,3-elimination of chloromethyl trimethylsilyl(α-aryl)methyl ethers promoted by flouride ion under mild and neutral conditions which provide an one-step synthesis of dihydrofurans and tetrahydrofurans via [3 + 2] cycloadditions to activated multiple π-bonds such as α,β-unsaturated alkenes and alkynes.