Synthesis of α-Acyloxyketone Derivatives <i>via</i> the Platinum-Catalyzed Migration of Propargylic Esters
作者:Chihiro Tsukano、Sho Yamamoto、Yoshiji Takemoto
DOI:10.1248/cpb.c15-00417
日期:——
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。