Flexible stereoselective functionalizations of ketones through umpolung with hypervalent iodine reagents.
The functionalization of carbonyl compounds in the α-position has gathered much attention as a synthetic route because of the wide biological importance of such products. Through polarity reversal, or "umpolung", we show here that typical nucleophiles, such as oxygen, nitrogen, and even carbon nucleophiles, can be used for addition reactions after tethering them to enol ethers. Our findings allow novel retrosynthetic planning and rapid assembly of structures previously accessible only by multistep sequences.
School of Chemistry, Cardiff University, Park Place, Main Building, Cardiff CF10 3AT (UK) http://www.cf.ac.uk/chemy/wirth.
Pushpak
P
Mizar
Thomas
T
Wirth
amination; hydroxylation; hypervalent iodine; stereoselective synthesis; umpolung