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2005
Ring closure reactions
O 0130
New '2-Phenylnaphthalene"-Mediated Synthesis of Benzo[b]naphtho[2,3-d]fuand 6-Oxa-benzo[a]anthracene--5,7,12-triones: First Total
23- 042 ran-6,11-diones
Synthesis of 6-Oxa-benzo[a]anthracene-5-ones. — A divergent synthesis of compounds (IV) from aldehydes (I) is presented. The route via cyclization of naphthols (II)
is found to be shorter and more efficient than that via naphthoquinone (VI). The former
method is extended to the synthesis of compound (X). — (MARTINEZ, A.;
FERNANDEZ, M.; ESTEVEZ, J. C.; ESTEVEZ*, R. J.; CASTEDO, L.; Tetrahedron
61 (2005) 5, 1353-1362; Dep. Quim. Org., Fac. Quim., Univ. Santiago de Compostela,
E-15782 Santiago de Compostela, Spain; Eng.) — Klein
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