Three kinds of 4-hydroxycoumarin derivatives, namely, biscoumarins
(1–4), epoxydicoumarins (5–8) and dihydropyrans (9–12),
were synthesized and the antibacterial activity of each of them was
evaluated. The result of preliminary bioassay shows that the lowest
minimal inhibitory concentration (MIC) of compounds 1 and 2
against drug-sensitive
The ionic liquid tetramethylguanidium acetate is very efficient for the one-pot catalytic preparation of biscoumarins through a domino Knoevenagel–Michael reaction at room temperature.