Fulvene cycloaddition reactions in water: influence on rate and selectivity
作者:Axel G Griesbeck
DOI:10.1016/0040-4039(88)85194-3
日期:1988.1
The thermal cycloadditionreaction between dimethylpentafulvene and 1,4-benzoquinone or maleic anhydride was investigated under several solvent and concentration conditions. In aqueous media the reaction rates were highly accelerated and the - ratio for could be controlled from 9:1 to 1:9 depending on the formal concentration in water.
Synthese von 7-Alkyliden-tricyclo[6.3.0.02,6]undeca-4,9-dien-3,11-dionen
作者:Axel G. Griesbeck
DOI:10.1002/prac.19923340703
日期:——
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.
Unprecedented Microwave Effects on the Cycloaddition of Fulvenes. A New Approach to the Construction of Polycyclic Ring Systems
作者:Bor-Cherng Hong、Yeong-Jou Shr、Ju-Hsiou Liao
DOI:10.1021/ol017304q
日期:2002.2.1
[GRAPHICS]Novel cycloaddition reactions between fulvenes and various alkenes and alkynes are promoted by the use of microwave irradiation. These processes result in the formation of intriguing polycyclic ring systems such as those found in isobarbatene, alcyopterosin, and enokipodin A. Importantly, these reactions do not occur under conventional thermolytic conditions.
GRIESBECK, AXEL G., TETRAHEDRON LETT, 29,(1988) N 28, C. 3477-3480