Synthese von 7-Alkyliden-tricyclo[6.3.0.02,6]undeca-4,9-dien-3,11-dionen
摘要:
The cycloaddition reaction of 6-alkyl- as well as 6,6-dialkyl substituted pentafulvenes 1a - f with 1,4-benzoquinone proceeded efficiently and highly endo-stereoselectively when water was used as the solvent. The adducts 2a - f easily underwent intramolecular photocycloaddition when irradiated in acetone or cyclohexane. The resulting trishomocubanediones 3a - f could be transformed into linearly fused tricyclopentanoids 4a - f via flash vacuum thermolysis.