Base catalysed rearrangements involving ylide intermediates. Part 11. Rearrangements of 3-phenylprop-2-ynylammonium ylides
作者:Sivapathasuntharam Mageswaran、W. David Ollis、Dolores A. Southam、Ian O. Sutherland、Yodhathai Thebtaranonth
DOI:10.1039/p19810001969
日期:——
novel [1,3] rearrangement involving the migration of a dimethylamino-group. The base catalysed rearrangements of the bicyclic propynylammonium salts (52) and (56) do not show the inhibition expected for concerted [3,2] sigmatropic rearrangements in such bicyclic systems. This observation provides further evidence for a two-stage mechanism for the apparent [3,2] sigmatropic rearrangement of propynylammonium
丙烯酰胺鎓盐(5)与氢氧化钠水溶液反应,得到丙二烯(7)和新的内酯(11)。(7)和(11)的同时形成表明,丙炔基内酯(6)到丙二烯(7)的明显的[3,2]σ重排可能涉及两个阶段的机制。描述了叶立德(11)的反应,以及丙二烯(7)和衍生自丙烯酰胺鎓盐(23)和(27)的许多类似的丙二烯的反应。丙二烯可识别三种类型的反应,包括涉及二甲基氨基基团迁移的新型[1,3]重排。双环丙烯酰胺盐(52)和(56)的碱催化重排未显示出在此类双环系统中预期的协同[3,2]σ重排的抑制作用。