Investigation of oxacycle formation by base-promoted endo-mode ring-closing reaction of allenes
作者:Shinji Kitagaki、Takamasa Kawamura、Daisuke Shibata、Chisato Mukai
DOI:10.1016/j.tet.2008.09.069
日期:2008.12
The base-promoted endo-mode ring closure of electron-withdrawing group-substituted allenes provided the following interesting results: (1) the endo-mode ring-closing reaction of 1-(benzyloxycarbonyl)-1-(ω-hydroxyalkyl)allenes smoothly proceeded during the formation of five-, seven-, and eight-membered rings; (2) base treatment of benzyloxycarbonylallene and sulfonylallene, having a 2-hydroxyethyl group
吸电子基团取代的烯基的碱促进的内模闭环提供了以下有趣的结果:(1)1-(苄氧基羰基)-1-(ω-羟烷基)烯丙基的内模闭环反应平稳在形成五元,七元和八元环的过程中进行;(2)在醛的存在下,在醛的存在下,对在C-1位具有2-羟乙基的苄氧羰基烯丙基和磺酰基烯基进行碱处理,使该环闭环并与该醛缩合一锅;和(3)内通过,得到六元内酯羧酸根阴离子的内部攻击sulfonylallenes的-mode环闭合。