Rhodium‐Catalyzed Enantioselective Conjugate Silyl Transfer: 1,4‐Addition of Silyl Boronic Esters to Cyclic Enones and Lactones

Missing linkage: A chiral cationic rhodium complex catalyzes the enantioselective conjugate addition of silyl anion equivalents to cyclic α,β-unsaturated ketones (X=CH2) and esters (X=O; see scheme). This unprecedented catalytic process enables the asymmetric formation of a carbon–silicon bond, thus providing a facile access to α-chiral organosilicon compounds.