Chemistry Letters p. 527 - 530 (1994)
Update date:2022-08-11
Topics:
Imagawa, Kiyomi
Nagata, Takushi
Yamada, Tohru
Mukaiyama, Teruaki
N-Alkyl imidazoles are effective axial ligands to achieve highly enantioselective epoxidation of unfunctionalized olefins by combined use of molecular oxygen and pivalaldehyde with optically active Mn(III)-salen-type complex catalysts.In the presence of N-alkyl imidazole, the epoxidation od 2,2-dimethylchromene proceeded smoothly to afford the corresponding optically active epoxide in 92percent enantiomeric excess.
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