A simple, efficient synthesis of 3-arylmethyl-7, 8-dihydro-6H-chromene-2, 5-dione 4 from Baylis–Hillman adduct acetates derived from aromatic aldehydes and cyclohexane-1, 3- diones under solvent-free conditions is described. Interestingly, when Baylis–Hillman adducts derived from aliphatic aldehydes were tested under the similar conditions, the unexpected stereoisomers 5 and 6 were obtained in moderate yields. A plausible ...
![2-[Acetoxy-(3-nitro-phenyl)-methyl]-acrylic acid methyl ester结构式](https://image.chemsrc.com/caspic/002/503073-34-5.png)
