Optically active aldiminato cobalt(II) complexes as efficient catalysts for enantioselective cyclopropanation of styrenes with diazoacetates

Chemistry Letters

Volumn , Issue 8, 1999, Pages 719-720

  Yamada, Tohru ^a   Ikeno, Taketo ^a   Sekino, Hiroyuki ^a   Sato, Mitsuo ^a  

^a KEIO UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0033245539     PISSN: 03667022     EISSN: None     Source Type: Journal    
DOI: 10.1246/cl.1999.719     Document Type: Article

References (24)

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20. 4 to convert it to the corresponding mixture of alcohols and then HPLC analysis of the mixture revealed 84% ee for the trans isomer (Daicel Chiralcel OB-H and/or OD-H) and 85% ee for the cis isomer (Chiralcel OB-H), respectively.
21. When 3-fluoro-, 4-cyano-, 4-(N,N-dimethylamino)-, and 4-amino-pyridines were used as additives, the cyclopropanecarboxylates were obtained in 40% yield with 76% ee (trans), 38% yield with 74% ee, 36% yield with 79% ee, and 31% yield with 78% ee, respectively.
22. A similar effect of N-alkylimidazole or pyridine derivatives on the enantioselection was observed during the enantioselective aerobic epoxidation catalyzed by the optically active aldiminato manganese(III) complex. T. Yamada, K. Imagawa, T. Nagata, and T. Mukaiyama, Bull. Chem. Soc. Jpn., 67, 2248 (1994). Recently, it was reported that a donor ligand, such as 2-methylimidazole or pyridine N-oxide improved the enantioselection in the salen-manganese(III)-catalyzed epoxidation when iodosylbenzene was used as the terminal oxidant. R. Irie, Y. Ito, and T. Katsuki, Synlett, 1991, 265.
23. A similar effect of N-alkylimidazole or pyridine derivatives on the enantioselection was observed during the enantioselective aerobic epoxidation catalyzed by the optically active aldiminato manganese(III) complex. T. Yamada, K. Imagawa, T. Nagata, and T. Mukaiyama, Bull. Chem. Soc. Jpn., 67, 2248 (1994). Recently, it was reported that a donor ligand, such as 2-methylimidazole or pyridine N-oxide improved the enantioselection in the salen-manganese(III)-catalyzed epoxidation when iodosylbenzene was used as the terminal oxidant. R. Irie, Y. Ito, and T. Katsuki, Synlett, 1991, 265.
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