Recyclable iron(<scp>ii</scp>) caffeine-derived ionic salt catalyst in the Diels–Alder reaction of cyclopentadiene and α,β-unsaturated <i>N</i>-acyl-oxazolidinones in dimethyl carbonate
作者:Di Meng、Dazhi Li、Thierry Ollevier
DOI:10.1039/c9ra04098f
日期:——
Iron(II) triflate was used in combination with caffeine-derived salts as recyclable catalysts for the Diels–Alderreaction run in dimethyl carbonate (DMC) as a green solvent. The catalyst was prepared as an ionic salt from a xanthinium salt and Fe(OTf)2. Various substrates including α,β-unsaturated carbonyl and N-acyloxazolidinone derivatives were reacted with cyclopentadiene using this recyclable
三氟甲磺酸亚铁 ( II ) 与咖啡因衍生盐结合使用,作为可回收催化剂,在碳酸二甲酯 (DMC) 作为绿色溶剂中进行狄尔斯-阿尔德反应。该催化剂由xanthinium盐和Fe(OTf) 2制备为离子盐。使用这种可回收催化剂,包括α,β-不饱和羰基和N-酰基恶唑烷酮衍生物在内的各种底物与环戊二烯反应。使用低催化剂负载量(1 mol%)可提供高产率(高达 99%)的相应环加合物。多次运行证明了催化剂的回收和效率。
Synthesizing Chiral Hydrocarbazoles with a Tetrasubstituted Carbon Using Holmium-Catalyzed Enantioselective [4 + 2] Cycloaddition: Mechanistic Insights from Luminescence and DFT Studies