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 remarkable base in these oxidations as other bases such as triethyl amine, diisopropylethyl amine, and 1,4-diazabicyclo[2.2.2]octane (DABCO) are absolutely inefficient
已经研究了1,8-二氮杂双环[5.4.0]十一碳-7-烯(DBU)在二氯乙烷中用无水t-BuOOH(TBHP)对缺电子的烯烃进行环氧化。立体要求高于对碱性H 2 O 2的要求-在其他氧化中,DBU被认为是一种显着的碱,因为其他碱如三乙胺,二异丙基乙胺和1,4-二氮杂双环[2.2.2]辛烷(DABCO)绝对效率低下。DBU可有效促进α,β-不饱和δ-内酯的氧化,而大多数常规方法要么失败要么表现不佳。