The reactions of 4,5-dehydrotropone with 4-phenyloxazols
摘要:
4,5-Dehydrotropone reacted with 4-phenyl-, 5-methyl-4-phenyl-, and 2,5-dimemyl-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.