Abstract

The tandem Michael-aldol reaction of 1-[2-(methylsulfanyl)-phenyl]prop-2-en-1-one (1) or the seleno congener 4 with p-nitrobenzaldehyde in the presence of BF3.Et2O gave the Baylis-Hillman adduct 2 or 5 and onium salt 3 or 6, respectively, and selenochromanone 7 from 4.

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