Inter- and intramolecular carbene reactions of diazoketones tethered to tricarbonyliron coordinated acyclic dienes. New tricarbonyliron complexes of cyclohexa-2,4-dienone and cyclopent-2-enone
作者:Michel Franck-Neumann、Philippe Geoffroy、Dominique Gassmann、Alain Winling
DOI:10.1016/j.tetlet.2004.05.052
日期:2004.7
terminal position have been synthesized, and their decomposition reactions as carbene precursors studied. Intermolecular reactions with nucleophilic olefins were observed with Cu(acac)2 as catalyst, the tricarbonyliron playing the role of an efficient protecting group of the diene fragment. With rhodiumII acetate, intramolecular reactions predominate, with formation of five-membered rings, in the side
合成了一系列末端连接在三羰基铁配位二烯上的重氮酮,并研究了它们作为卡宾前体的分解反应。以Cu(acac)2为催化剂观察到与亲核烯烃的分子间反应,三羰基铁起二烯片段的有效保护基的作用。与铑II在乙酸乙烯酯中,分子内反应占主导地位,在侧链中形成五元环,或更不常见的是,环戊烯酮与重排的二烯配体并排连接。异常地,由于铁的阳离子稳定作用,在此也形成了侧链中的六元环。在位置2处拴在配位二烯上的重氮酮的热分解过程中,观察到了仍然不同的反应:形成了环己2-4-二烯酮的稳定络合物(铁辅助卡宾反应和多次氢迁移)。