New version of redox-troponization ? oxidative expansion of apara-semiquinoid ring in the reaction of 4-methyl-4-bromomethyl-2,5-cyclohexadien-1-one with tetrakis(triphenylphosphine)palladium
作者:V. A. Nikanorov、G. V. Gavrilova、A. V. Yur'ev、V. I. Rozenberg、O. A. Reutov
DOI:10.1007/bf01151309
日期:1995.9
Abstract4-Methyl-4-bromomethyl-2,5-cyclohexadien-1-one reacts with Pd(PPh3)4 in benzene to give 4-methyl-2,4,6-cycloheptatrien-1-one. The reaction occurs as intramolecular carbometallation of the enone fragment of the starting dienone followed by rearrangement—dehydrometallation or involves a sequence of steps,viz., homolytic abstraction of the halogen atom, cyclization, recyclization, and dehydrogenation
摘要4-甲基-4-溴甲基-2,5-环己二烯-1-酮在苯中与Pd(PPh3)4反应生成4-甲基-2,4,6-环庚三烯-1-酮。该反应发生为起始二烯酮的烯酮片段的分子内碳金属化,然后是重排 - 脱氢金属化或涉及一系列步骤,即卤素原子的均裂提取、环化、再环化和脱氢。