Nucleophilic vinylic substitution of halocoumarins and halo-l,4-naphthoquinones with morpholine
Changsok Oh, Inwoo Yi, Kyong Pae Park
Journal of Heterocyclic Chemistry
Volume 31, Issue 4, pages 841–844, 1994
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http://dx.doi.org/10.1002/jhet.5570310426