intramolecular ionic cycloaddition of the proposed intermediate arenoxenium cations. Treatment of the same precursors with aluminium chloride results in a stereoselective intramolecular cyclisation to spiroketones. Evidence that the mechanism of formation involves a cyclic aluminium intermediate is presented. © 1997 Elsevier Science Ltd.
5-(
2-萘酚)-1-
戊烯与I(III)试剂的反应导致在C-1处发生亲核取代,而不是所提议的中间体槟榔烯阳离子的[4 + 2]分子内离子环加成。用
氯化铝处理相同的前体会导致立体选择性分子内环化为螺酮。提供了形成机理涉及环状铝中间体的证据。©1997爱思唯尔科学有限公司。