substituted methylenecycloalkanes. Methyl groups in the 2-position are transformed into angular methyl groups in decalin or indane derivatives. The chloromethylaluminum alkoxides produced in these reactions, i.e. 3 and 7, undergo an Oppenaueroxidation in situ in the presence of excess acrolein to give the corresponding ketone in good yield. Using these procedures, indenone 8a has been prepared from
Five-membered ring annulation via thermal rearrangement of β-cyclopropyl α,β-unsaturated ketones. A formal total synthesis of the sesquiterpenoid (±)-zizaene
作者:Edward Piers、Jacques Banville、Cheuk Kun Lau、Isao Nagakura
DOI:10.1139/v82-425
日期:1982.12.1
1-one (16) was allowed to react with dimethyloxosulfonium methylide in dimethyl sulfoxide – tetrahydrofuran, 3-(1-methylcyclopropyl)-2-cyclohexen-1-one (17) was produced in 59% yield. Although thermal rearrangement (~425–450 °C) of compounds 11 and 17 produced high yields of the annulation products 19 and 22, respectively, similar reactions involving the β-cyclopropyl enones 12 and 13 were not efficient