Manganese(III) or Cobalt(III)-Mediated Oxidative Radical Reactions of Terminal Dienes. One-Pot Synthesis of Bis(dihydrofuran)s
作者:Hiroshi Nishino、Tomoaki Yoshida、Kazu Kurosawa
DOI:10.1246/bcsj.64.1097
日期:1991.4
5-hexadienes with tris(2,4-pentanedionato)-manganese(III) ([Mn(acac)3]) gave α,ω-bis(dihydrofuryl)alkanes (abbreviated bis(dihydrofuran)s, hereafter) in good yields. The reactions with tris(2,4-pentanedionato)cobalt(III) ([Co(acac)3]) instead of [Mn(acac)3] yielded the same bis(dihydrofuran)s quantitatively. The dienes also reacted with ethyl 3-oxobutanoate in the presence of manganese(III) acetate ([Mn(OAc)3])
末端二烯如 1,4-戊二烯和 1,5-己二烯与三(2,4-戊二酮)-锰(III) ([Mn(acac)3]) 反应生成α,ω-双(二氢呋喃基)烷烃(缩写为双(二氢呋喃),下文中)收率良好。与三(2,4-戊二酮)钴(III) ([Co(acac)3]) 代替[Mn(acac)3] 的反应定量产生了相同的双(二氢呋喃)。在乙酸锰 (III) ([Mn(OAc)3]) 或乙酸钴 (III) ([Co(OAc)3]) 存在下,二烯还与 3-氧代丁酸乙酯反应生成相应的双(二氢呋喃) s。1,3-丁二烯与锰(III)或钴(III)配合物的反应仅提供一(二氢呋喃)和氧化重排产物,但未形成相应的双(二氢呋喃)。反应 1, 在 [Mn(OAc)3] 存在下,5-己二烯与丙二酸氢乙酯并没有得到双环化产物,而是以中等产率得到单(γ-内酯)。双(二氢呋喃)形成的合成应用及局限性...