The soft enolization of an acylated oxazolidinone using di-n-butylboron triflate (n-Bu2BOTf) and trialkylamines and subsequent aldol addition was probed structurally and mechanistically using a combination of IR and NMR spectroscopies. None of the species along the reaction coordinate show a penchant for aggregating. Complexation of the acylated oxazolidinone by n-Bu2BOTf was too rapid to monitor,
使用二-酰化的
恶唑烷酮的软烯醇化Ñ -butylboron
三氟甲磺酸酯(Ñ -Bu 2 BOTf)和
三烷基胺和随后的醛醇加成物探测结构上和机械上用IR和NMR光谱的组合。沿着反应坐标的所有物种均未显示出易于聚集的倾向。通过酰化的
恶唑烷酮的络合Ñ -Bu 2 BOTf太快速监测,因为是用Et随后的烯醇化3 N(
三乙胺)。预成形Ñ -Bu 2 BOTf·的Et 3N络合物显示出弱的
路易斯酸度和相关的可处理速率,通过具有复杂抗衡离子的过渡结构揭示了限速络合物。Ñ -Bu 2 BOTf·我-Bu 3 Ñ轴承受阻胺移位的限速步骤,质子转移。速率研究表明,
异丁醛与羟醛的加成反应与其他人一样。