An efficient and straightforward stereoselective alkylation reaction of enamides using commercially available and easily accessible unactivated alkyl carboxylicacids as alkylating agents is described, giving rise to a diverse array of synthetically important and geometrically defined β-alkylated enamides bearing primary, secondary, or tertiary alkyl moieties. This transformation also shows excellent
Stereoselective β-C(sp2)–H alkylation of enamides with redox-active N-hydroxyphthalimide esters via a photoredox-catalyzed decarboxylative cross-coupling reaction is demonstrated. This methodology features operational simplicity, broad substrate scopes, and excellent stereoselectivities and functional group tolerance, affording a diverse array of geometrically defined and synthetically valuable enamides
Direct C(
<i>sp</i>
<sup>2</sup>
)‐H Arylsulfonylation of Enamides
<i>via</i>
Iridium(III)‐Catalyzed Insertion of Sulfur Dioxide with Aryldiazonium Tetrafluoroborates
An iridium(III)‐catalyzed three‐component reaction of enamides, aryldiazonium tetrafluoroborates, and 1,4‐diazabicyclo[2.2.2]octane bis(sulfur dioxide) (DABSO) for the direct C(sp2)−H arylsulfonylation of enamides is developed. This transformation provides a robust and straightforward approach for preparing a diverse array of β‐amidovinyl sulfones in moderate to excellent yields and high stereoselectivities
only: An atom‐economical synthetic route towards arylated Z‐enamides through double CH functionalization is described. The Z/E selectivity of the palladium‐catalyzed monoarylation is absolute (step A in scheme), and the molecular complexity of the products can be further endowed by a sequential second arylation, which requires the use of trifluoracetic acid (TFA; step B).
Photoredox-catalyzed regio- & stereoselective C(sp<sup>2</sup>)–H cyanoalkylation of enamides with cycloketone oximes <i>via</i> selective C–C bond cleavage/radical addition cascade
A photoredox-catalyzed regio- and stereoselective Heck-type cyanoalkylation of synthetically prominent enamides with cycloketone oximes via selective β-C–C bond scission/selective radicaladdition cascade is developed, enabling the incorporation of synthetically versatile and pharmaceutically appealing distal cyanoalkyl moieties into enamide scaffolds under mild conditions. The synthetic importance