Palladium-Catalyzed [3+2] Cycloaddition of Carbon Dioxide and Trimethylenemethane under Mild Conditions
作者:George E. Greco、Brittany L. Gleason、Tiffany A. Lowery、Matthew J. Kier、Lisa B. Hollander、Shoshanah A. Gibbs、Amanda D. Worthy
DOI:10.1021/ol7017246
日期:2007.9.1
with trimethylenemethane (TMM) under mild conditions (1 atm, 75 degrees C, 30 min) to produce a gamma-butyrolactone product in 63% yield, when the Pd-TMM complex is generated from 2-(acetoxymethyl)-3-(trimethylsilyl)propene. The reaction reported here is more rapid than the all-carbon [3+2] cycloaddition, and only the gamma-butyrolactone is produced in a competition experiment. With substituted substrates
当Pd-TMM复合物在温和条件下(1 atm,75摄氏度,30分钟),二氧化碳与三甲基甲烷(TMM)进行Pd催化的[3 + 2]环加成反应,以63%的收率生产出γ-丁内酯产品。由2-(乙酰氧基甲基)-3-(三甲基甲硅烷基)丙烯产生。此处报道的反应比全碳[3 + 2]环加成反应更快,并且在竞争实验中仅生成γ-丁内酯。使用取代的底物,该反应是完全区域选择性的,产生衍生自动力学Pd-TMM复合物的产物。