Intramolecular 2H Group-Transfer (Dyotropic Rearrangements) in Alicyclic and Heterocyclic Bridged-Ring Systems11Preliminary comnunication: K. Mackenzie, G.J. Proctor and D.J. Woodnutt, Tetrahedron Letters 1984, 977.
作者:K. Mackenzie、G. Proctor、D.J. Woodnutt
DOI:10.1016/s0040-4020(01)87804-2
日期:——
Examples of alicyclic frameworks containing a cyclohexa-1,3-diene ring as 2H donor held proximate to a variously-substituted acceptor Π-bond are compared for their reactivity in thermal 2H group-transfer reactions. Kinetic analysis reveals marked effects on rearrangement-rate as the acceptor Π-bond substieuents are varied. Attempted synthesis of exact structural analogues of these compounds but with
比较了在2H基团热转移反应中它们的反应性,比较了脂环骨架的实例,该脂环骨架的例子是将环己-1,3-二烯环作为2H供体,其紧邻各种取代的受体Π键。动力学分析表明,随着受体-键取代基的变化,对重排率有显着影响。尝试合成这些化合物的确切结构类似物,但用2,3-二氮杂环己二烯组分代替环己二烯元素[通过3,6-二芳基-1,2:4,5-四嗪的(4 + 2)Π环加成反应生成二烯亲二烯体]通常使用[异狄氏剂型]来产生伴随2H基团转移的产物。将这些结果与具有相关的关键立体化学特征的五环2-吡唑啉衍生物的相似但通常较慢的2H基团转移重排进行了比较,这些衍生自1,异狄氏剂类型的偶极亲和性的3-二芳基硝化胺(4 + 2)Π加合物。在所研究的脂环族和杂环代表性体系中,受体-键的烷氧基和氯取代均会延迟2H基团的转移,这表明了其真正的周环行为。