The Epoxy-Ramberg-Bäcklund Reaction: A New Route to Allylic Alcohols
摘要:
A new variant of the Ramberg-Backlund reaction is described, the epoxy-Ramberg-Backlund reaction (ERBR), in which alpha,beta-epoxysulfones, on treatment with base, are convened into a range of mono-, di- and tri-substituted allylic alcohols. The scope and limitations of the ERBR are discussed. (C) 1997 Elsevier Science Ltd.
The Epoxy-Ramberg-Bäcklund Reaction: A New Route to Allylic Alcohols
摘要:
A new variant of the Ramberg-Backlund reaction is described, the epoxy-Ramberg-Backlund reaction (ERBR), in which alpha,beta-epoxysulfones, on treatment with base, are convened into a range of mono-, di- and tri-substituted allylic alcohols. The scope and limitations of the ERBR are discussed. (C) 1997 Elsevier Science Ltd.
1,8-diazabicyclo [5.4.0] undec-7-ene: A remarkable base in the epoxidation of α, β-unsaturated-δ-lactones and other enones with anhydrous t-BuOOH
作者:Veejendra K. Yadav、Kamal K. Kapoor
DOI:10.1016/0040-4020(95)00472-k
日期:1995.7
1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) has been studied for the epoxidation of electron deficient alkenes with anhydrous t-BuOOH (TBHP) in dichloroethane. Steric demands are higher than that for alkaline H2O2- DBU is recognised as a remarkablebase in these oxidations as other bases such as triethyl amine, diisopropylethyl amine, and 1,4-diazabicyclo[2.2.2]octane (DABCO) are absolutely inefficient