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6. New Ring closure reactions on phenylmalonyl heterocycles
Stadlbauer W., Kappe Th.
3. VöCH-meeting, Graz (Austria), 18.10.1979 (Österr. Chem. Z. 1979 (10) 193)

Abstract: Phenylmalonyl heterocycles such as 3-phenyl-4-hydroxy-2-quinolones or 3-phenyl-4-hydroxycoumarins cyclize with high boiling esters such as diphenyl carbonate or arylmalonates to give isocoumarines. Dehydrogenation of 3-phenyl-4-hydroxy-2-quinolones or 3-phenyl-4-hydroxycoumarins with palladium on charcoal gives coumestan- or azacoumestanderivates.


abstract scheme
abstract scheme