Co(III)-Salen catalyzed asymmetric cyclopropanation

Synlett

Volumn 1995, Issue 8, 1995, Pages 825-826

  Fukuda, Tsutomu ^a   Katsuki, Tsutomu ^a  

^a KYUSHU UNIVERSITY   (Japan)

Author keywords

(salen)cobalt(III) complex; asymmetric cyclopropanation; Co(III) salen catalyst

Indexed keywords

EID: 0003173850     PISSN: 09365214     EISSN: 14372096     Source Type: Journal    
DOI: 10.1055/s-1995-5104     Document Type: Article

References (16)

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7. Previous example of Co-catalyzed asymmetric cyclopropanation, see; Nakamura, A.; Konishi, A.; Tatsuno, Y.; Otsuka, S. J. Am. Chem. Soc. 1978,100, 3443.
8. Nakamura et al. also reported one example of Co(II)-salen catalyzed asymmetric cyclopropanation in the same paper, though enantioselectivity observed was poor (5% ee).
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13. Asymmetric cyclopropanation using rranr-RuC12(pyboxip)( ethylene) complex as a catalyst shows high frans-selectivity up to 98:2, as well as high enantioselectivity Nishiyama, H.; Itoh, Y.; Matsumoto, H.; Park, S.-B.; Itoh, K. J. Am. Chem. Soc., 1994,116, 2223.
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15. The calculation with TRIPOS-SYBYL on an IRIS Indigo showed that carbene-Co(V) salen complex takes folded structure and the ester group protrudes over the downward benzene ring (A).
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