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Journal articles
Designing ‘Totem’ C2-Symmetrical Iron Porphyrin Catalysts for Stereoselective Cyclopropanations
Abstract : The catalytic activity of the iron(III) C2 chiral porphyrin Fe(2)(OMe) in alkene cyclopropanation is herein reported. The catalyst promoted the reaction of differently substituted styrenes with diazo derivatives with trans-diastereoselectivities and enantioselectivities up to 99:1 and 87 %, respectively. In addition, high TON and TOF values (up to 10 000 and 120 000 h−1, respectively) were observed indicating good activity and stability of the catalyst in optimized experimental conditions. The study of the cyclopropanation reaction revealed that the porphyrin skeleton is composed of two ‘totem’ parts which were independently responsible for the observed enantio- and diastereoselectivities. To further our research we also investigated the catalytic role of the methoxy axial ligand coordinated to the iron atom. The molecular structure of Fe(2)(OMe) was optimized by DFT calculations which were also employed to achieve a better understanding of the mechanistic details of the carbene transfer reaction. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Keywords :
Stereo-selective
Iron porphyrin catalyst
Cyclopropanation reaction
Diastereoselectivities
Experimental conditions
Catalyst activity
Catalysts
Density functional theory
Iron
Iron research
Porphyrins
Stereoselectivity
Styrene
Carbene transfer
Cyclopropanation
Stereoselective reactions
Iron compounds
https://hal-univ-rennes1.archives-ouvertes.fr/hal-01367224
Contributor : Laurent Jonchère <>
Submitted on : Thursday, September 15, 2016 - 5:17:26 PM
Last modification on : Wednesday, January 13, 2021 - 3:39:56 AM
Contributor : Laurent Jonchère <>
Submitted on : Thursday, September 15, 2016 - 5:17:26 PM
Last modification on : Wednesday, January 13, 2021 - 3:39:56 AM
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