Cobalt(II) complexes of chiral bis-binaphthyl porphyrins were prepared, and their catalytic activity in the asymmetric cyclopropanation of alkenes with ethyl diazoacetate was examined. Good yields and enantioselectivities (up to 90% ee) were observed with cis/trans ratios reaching 11:89. UV-vis and 1H NMR studies suggest that the axial nitrogen ligand N-methylimidazole could play a role in changing the enantioselectivity of the reaction.
Asymmetric cyclopropanation of olefins catalyzed by chiral cobalt(II)-binaphthyl porphyrins / S. Fantauzzi, E. Gallo, E. Rose, N. Raoul, A. Caselli, S. Issa, F. Ragaini, S. Cenini. - In: ORGANOMETALLICS. - ISSN 0276-7333. - 27:23(2008), pp. 6143-6151.
Asymmetric cyclopropanation of olefins catalyzed by chiral cobalt(II)-binaphthyl porphyrins
S. FantauzziPrimo
;E. GalloSecondo
;A. Caselli;F. RagainiPenultimo
;S. CeniniUltimo
2008
Abstract
Cobalt(II) complexes of chiral bis-binaphthyl porphyrins were prepared, and their catalytic activity in the asymmetric cyclopropanation of alkenes with ethyl diazoacetate was examined. Good yields and enantioselectivities (up to 90% ee) were observed with cis/trans ratios reaching 11:89. UV-vis and 1H NMR studies suggest that the axial nitrogen ligand N-methylimidazole could play a role in changing the enantioselectivity of the reaction.File | Dimensione | Formato | |
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