Traceless Rhodium-Catalyzed Hydroacylation Using Alkyl Aldehydes: The Enantioselective Synthesis of β-Aryl Ketones
作者:Anaïs Bouisseau、Ming Gao、Michael C. Willis
DOI:10.1002/chem.201604035
日期:2016.10.24
A one‐pot three‐step sequence involving Rh‐catalyzed alkene hydroacylation, sulfide elimination and Rh‐catalyzed aryl boronic acid conjugate addition gave products of traceless chelation‐controlled hydroacylation employing alkyl aldehydes. The stereodefined β‐aryl ketones were obtained in good yields with excellent control of enantioselectivity. Good variation of all three reaction components is possible
Palladium-Catalyzed Reactions of Enol Ethers: Access to Enals, Furans, and Dihydrofurans
作者:Matthew G. Lauer、William H. Henderson、Amneh Awad、James P. Stambuli
DOI:10.1021/ol3028994
日期:2012.12.7
The palladium-catalyzed oxidation of alkyl enolethers to enals, which employs low loadings of a palladium catalyst, is described. The mild oxidation conditions tolerate a diverse array of functional groups, while allowing the formation of di-, tri-, and tetrasubtituted olefins. The application of this methodology to intramolecular reactions of alkyl enolethers containing pendant alcohols provides
Enantioselective Three-Component Assembly of β′-Aryl Enones Using a Rhodium-Catalyzed Alkyne Hydroacylation/Aryl Boronic Acid Conjugate Addition Sequence
作者:Ming Gao、Michael C. Willis
DOI:10.1021/acs.orglett.7b01087
日期:2017.5.19
Rhodium-catalyzed alkyne hydroacylation using alkyl β-S-aldehydes, enantioselective rhodium-catalyzed aryl boronic acid conjugateaddition, and sulfide elimination are combined in sequence to provide β′-aryl enones. The reaction sequence is efficient and delivers highly functionalized products with excellent levels of enantiocontrol. Good variation of the three reaction components is demonstrated.
Intertwining Olefin Thianthrenation with Kornblum/Ganem Oxidations: Ene‐type Oxidation to Furnish α,β‐Unsaturated Carbonyls
作者:Péter Angyal、András M. Kotschy、Ádám Dudás、Szilárd Varga、Tibor Soós
DOI:10.1002/anie.202214096
日期:2023.1.9
A metal-free double oxidation of unactivated alkenes has been developed to deliver unsaturated conjugated carbonyls. This practical procedure allows valorization of the olefinic feedstock with high chemo- and stereoselectivity as demonstrated by the syntheses of difficult-to-access building blocks and industrially relevant pheromones and kairomones.
The first general synthesis of γ-fluoro α,β-unsaturated aldehydes was achieved from the corresponding silyl dienolethers and N-fluorobenzenesulfonimide (NFSI). The complete selectivity towards the γ position was rationalized thanks to DFT calculations.