Tetrahedron Letters p. 2203 - 2205 (2002)
Update date:2022-08-11
Topics:
Martins, Cristina I.
Coelho, Paulo J.
Carvalho, Luis M.
Oliveira-Campos, Ana M.F.
The synthesis of a permanent open form of a naphthopyran is described for the first time. The open form of the 10-hydroxy-2H-naphtho[1,2-b]pyran, obtained by reaction of 1,8-dihydroxy-naphthalene with 1,1-diphenylprop-2-yn-1-ol under acid catalysis, is stable due to the establishment of an intramolecular hydrogen bond.
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