Base catalysed rearrangements involving ylide intermediates. Part 7. The rearrangements of allyl(pentadienyl)- and propynyl(pentadienyl)ammonium cations. The [5,4] sigmatropic rearrangement
作者:Trevor Laird、W. David Ollis、Ian O. Sutherland
DOI:10.1039/p19800002033
日期:——
The base catalysed rearrangements of the cations (7), (17), (22), and (27) gave the enamines (9), (18), (23), and (28), which on hydrolysis yielded the aldehydes (10), (19), (24), and (29) respectively. The reactions are shown to be concerted [5,4] sigmatropic rearrangements proceeding via a nine-membered transition state involving 10π electrons. The base catalysed rearrangements of the 3-phenylprop-2-ynyl
阳离子(7),(17),(22)和(27)的碱催化重排产生烯胺(9),(18),(23)和(28),水解后产生醛( 10),(19),(24)和(29)。该反应显示为通过包含10π电子的九元过渡态进行的[5,4]σ重排。3-苯基丙-2-炔基(戊二烯基)铵阳离子的碱催化重排(51),(52),(60)和(61),但仅产生[1,2],[3, 2]和[5,2]σ重排。