A catalyst-free tandem reaction for synthesis of 4-nitromethyl-chromenes has been established from accessible α, βunsaturated ketones and CH3NO2. Target products were obtained in non-toxic solvent under catalyst-free conditions. Especially, the scope of substrates was expanded to tricyclic α, β-unsaturated ketones for the synthesis of tetracyclic heterocompounds in medium to good yields.
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