高等学校化学研究 ›› 2020, Vol. 36 ›› Issue (5): 865-869.doi: 10.1007/s40242-019-9186-z
YU Fengli1, CHI Yujie1, GAO Chong1, CHEN Ruirui2, XIE Congxia1, YU Shitao2
YU Fengli1, CHI Yujie1, GAO Chong1, CHEN Ruirui2, XIE Congxia1, YU Shitao2
摘要: A series of amino-acid-based ionic liquids was synthesized via one-step protonation of the corresponding L-amino acid by utilizing an array of proton sources. The catalytic activity of the amino-acid-based ionic liquids for the Baeyer-Villiger oxidation of cyclic ketones was investigated using cyclopentanone as a model cycloketone. The proline-based ionic liquid [ProH]CF3SO3 was shown to exhibit the best catalytic activity. The reaction condition was optimized to give the following reagent ratio of n(cyclopentanone):n(catalyst):n(H2O2)=1:0.06:4, 60℃ and 6 h. Under the optimum conditions, the conversion of cyclopentanone was 96.57% and the selectivity for δ-valerolactone was 73.01%. The catalytic activity was shown to be constant after 4 cycles. A simple treatment was allowed for the recover and the reuse of [ProH]CF3SO3. The successful utilization of [ProH]CF3SO3 to catalyze a host of cyclic ketones via Baeyer-Villiger oxidation clearly demonstrated the capacity of [ProH]CF3SO3 to tolerate variation in the substrate.