o-Methoxybenzylidenemalonates 1, which are available from o-methoxybenzaldehydes and diethyl malonate, were hydrolysed to the dipotassium malonates 2. Treatment of the salts 2 with trifluoroacetic acid–trifluoroacetic anhydride gave the title coumarins by a demethylative ring-closure reaction in 60–80% yield.
O. E. O. Hormi, C. Peltonen and R. Bergström (née Moisio), J. Chem. Soc., Perkin Trans. 1, 1991, 219 DOI: 10.1039/P19910000219
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