Tetrahedron Letters p. 8421 - 8424 (1994)
Update date:2022-08-05
Topics:
Nakazawa, Tomoo
Ishihara, Mariko
Jinguji, Mamoru
Miyatake, Ryuta
Sugihara, Yoshikazu
Murata, Ichiro
4,5-Dehydrotropone reacted with 4-phenyl-, 5-methyl-, and 2,5-dimethyl-4-phenyl-oxazol to give, involving facile loss of benzonitrile from the corresponding Diels-Alder adducts, furo<3,4-d>tropone and its 1-methyl and 1,3-dimethyl derivative, respectively.Protonation of furo<3,4-d>tropones yielded delocalized 6-hydroxy-3-oxaazulenium ions.
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