Added value: The [2+2] cycloaddition of silyl enol ethers with α,β-unsaturated esters, catalyzed by the superstrong acid triflic imide (Tf2NH), at room temperature in a flow microreactor system is reported. The micororeactor method achieves the [2+2] cycloaddition of unstable silyl enol ethers and acrylates, which is unsuccessful in batch reactors, even at room temperature.
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