Orthoquinone monoketal chemistry. Experimental and density functional theory studies on orthoquinol acetate rearrangements
作者:Stéphane Quideau、Matthew A. Looney、Laurent Pouységu、Sihyun Ham、David M. Birney
DOI:10.1016/s0040-4039(98)02448-4
日期:1999.1
methoxycarbonylcyclohexa-2,4-dienone, conveniently prepared from oxidative acetoxylation of its parent phenol with PhI(OAc)2 in CH2Cl2AcOH (3:1), cleanly undergoes 1,3-acetoxy migrations in the presence of silica gel at room temperature to furnish a 60:40 product mixture conceivably derived from [3,5] and [3,3] sigmatropic rearrangements. Density functional theory calculations indicate that the [3
非二聚邻醌单缩酮,6-乙酰氧基-6-甲氧基-3- methoxycarbonylcyclohexa -2,4-二烯酮,从与岛(OAC)其父苯酚的氧化乙酰氧基化方便地制备2在CH 2氯2 AcOH(3: 1),在室温下在硅胶存在下,干净地进行1,3-乙酰氧基迁移,以提供60:40的产物混合物,该混合物可能源自[3,5]和[3,3]σ重排。密度泛函理论计算表明,[3,5]位移是伪周环的,活化能非常低,为20.1 kcal / mol,比圆周[3,3]位移高5.4 kcal / mol,与定性一致。实验观察。