作者:Vemula Praveen Kumar、Vaddela Sudheer Babu、Kenzo Yahata、Yoshito Kishi
DOI:10.1021/acs.orglett.7b01128
日期:2017.5.19
Fe/Cu-mediated one-pot ketonesynthesis was reported. Unlike Ni- and Pd-mediated one-pot ketone syntheses, the reported Fe/Cu-mediated method allowed selective activation and coupling of alkyl iodides over vinyl iodides. The newly developed one-pot ketonesynthesis was applied to a synthesis of vinyl iodide/ketone 13, the left half of halichondrin B, as well as vinyl iodide/ketone 8a, the C20–C26 building
[EN] FE/CU-MEDIATED KETONE SYNTHESIS<br/>[FR] SYNTHÈSE DE CÉTONE MÉDIÉE PAR FE/CU
申请人:HARVARD COLLEGE
公开号:WO2019009956A1
公开(公告)日:2019-01-10
Provided herein are methods for preparing ketone-containing organic molecules. The methods are based on novel iron/copper-mediated ("Fe/Cu-mediated") coupling reactions. The Fe/Cu-mediated coupling reaction can be used in the preparation of complex molecules, such as halichondrins and analogs thereof. In particular, the Fe/Cu-mediated ketolization reactions described herein are useful in the preparation of intermediates en route to halichondrins.
An iron(II) chloride complex possessing a sterically demanding ortho-phenylene-tethered bisphosphine ligand shows a high catalytic activity in the Kumada–Tamao–Corriu coupling of nonactivated alkyl halides with aryl Grignard reagents. Primary, secondary, and tertiary alkyl halides can participate as an electrophilic coupling partner. A radical clock experiment using (iodomethyl)cyclopropane exclusively gives the corresponding ring-opening coupling product, suggesting intermediacy of alkyl radical species.
A Combined Mössbauer, Magnetic Circular Dichroism, and Density Functional Theory Approach for Iron Cross-Coupling Catalysis: Electronic Structure, In Situ Formation, and Reactivity of Iron-Mesityl-Bisphosphines
作者:Stephanie L. Daifuku、Malik H. Al-Afyouni、Benjamin E. R. Snyder、Jared L. Kneebone、Michael L. Neidig
DOI:10.1021/ja503596m
日期:2014.6.25
effective catalysts for C-C cross-coupling, the nature of the in situ formed iron species, elucidation of the active catalysts and the mechanisms of catalysis have remained elusive. A combination of (57)Fe Mössbauer and magneticcirculardichroism (MCD) spectroscopies of well-defined and in situ formed mesityl-iron(II)-SciOPP species combined with densityfunctionaltheory (DFT) investigations provides