The synthesis of α-acyloxyketones via the migration of a propargylic ester followed by the intramolecular nucleophilic addition of the resulting allene was achieved using a cationic platinum catalyst. The optimized conditions for this transformation were determined to be 3 mol% of Pt(cod)Cl2, 3 mol% of AgNTf2, and 3 eq of water in toluene at 100°C, and these conditions were successfully applied to the synthesis of a wide variety of α-aryl-α-acyloxyketones. The mechanism of this reaction was evaluated in detail based on the results of isotope labeling experiments using H218O.
通过使用阳离子
铂催化剂,实现了通过
丙炔酯迁移随后进行所得
丙二烯的分子内亲核加成来合成α-酰氧基酮的方法。确定这种转化的最佳条件为:3 mol%的Pt(cod)Cl2、3 mol%的AgNTf2和3 eq的
水在100°C的
甲苯中,这些条件成功应用于合成多种α-芳基-α-酰氧基酮。通过使用H218O的同位素标记实验结果,详细评估了该反应的机理。