Complementary Iron(II)‐Catalyzed Oxidative Transformations of Allenes with Different Oxidants
作者:Venkata R. Sabbasani、Hyunjin Lee、Yuanzhi Xia、Daesung Lee
DOI:10.1002/anie.201510006
日期:2016.1.18
Substituent‐ and oxidant‐dependent transformations of allenes are described. Given the profound influence of the substituent on the reactivity of allenes, the subtle differences in allene structures are manifested in the formation of diverse products when reacted with different electrophiles/oxidants. In general, reactions of nonsilylated allenes involve an allylic cation intermediate by forming a
描述了丙二烯的取代基和氧化剂依赖性转化。考虑到取代基对丙二烯反应性的深远影响,当与不同的亲电试剂/氧化剂反应时,丙二烯结构的细微差异体现在各种产物的形成中。通常,非甲硅烷基化的丙二烯的反应通过与杂化的C2形成DD键(2,3-二氯-5,6-二氰基对苯醌)或TBHP(通过在杂化C2上形成C-O键)来涉及烯丙基阳离子中间体。叔丁基过氧化氢)中,用的FeCl沿2 ⋅4ħ 2O(10摩尔%)。相反,甲硅烷基化丙二烯青睐炔阳离子中间体的由丙二烯氢化物转移到氧化剂,从而产生1,3-烯炔(E1产品)或丙炔醚THBP(S形成Ñ 1个产物)。DFT计算强烈支持由非甲硅烷基化和甲硅烷基化的丙二烯形成这些不同的假定阳离子中间体。