Self-assembled Solvent-regulated Phase Transfer Catalyst for Epoxidation of Non-functionalized Alkenes

Tan, Rong; Yin, Daqiang; Yu, Na; Ding, Yan; Zhao, Hongying

doi:10.1007/s10562-008-9825-6

Cited by 2 publications

(1 citation statement)

References 35 publications

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“…As expected, reaction solvent plays a crucial role in the asymmetric epoxidation of chromene. The reaction time of ionic liquid system is very short, and the product can be easily separated due to the solvent power of the ionic liquid for many organic and inorganic substances compared with the well-documented reaction time of Jacobson type chiral catalysts [39,40]. The experimental results show these complexes are effective catalysts for the asymmetric epoxidation of chromenes in the presence of ionic liquid.…”

Section: Catalytic Activity Studiesmentioning

confidence: 95%

Asymmetric Epoxidation of Chromenes Using Manganese(III) Complexes with Novel Chiral Salen-like Schiff Base Ligands

et al. 2012

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Three novel chiral salen-like schiff base ligands and their Mn(III) complexes containing different amino acid unit have been synthesized and characterized. Asymmetric epoxidation reactions show these complexes are effective catalysts for the chromenes with buffer NaOCl as terminal oxidant and pyridine N-oxide as co-catalyst in the presence of ionic liquid. Good-to -excellent enantioselectivity and acceptable yields can be obtained under optimum reaction conditions. Catalyst 4c gives the highest ee (95%) for 6-chloro-2,2-dimethylchromene among these catalytic performances. Furthermore, compared the enantioselectivity of catalyst 4c with the other two catalysts 4a and 4b, the positive experimental results suggest that the steric effect of the ligands plays an important role in the asymmetric catalysis.

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Section: Catalytic Activity Studiesmentioning

confidence: 95%