Iridium‐Catalyzed Chemo‐, Diastereo‐, and Enantioselective Allyl‐Allyl Coupling: Accessing All Four Stereoisomers of (
<i>E</i>
)‐1‐Boryl‐Substituted 1,5‐Dienes by Chirality Pairing
We report an iridium-catalyzed highly chemo-, diastereo-, and enantioselective allyl-allylcoupling between branched allyl alcohols and α-silyl-substituted allylboronate esters resulting in enantioenriched (E)-1-boryl-substituted 1,5-dienes. All four stereoisomers with two adjacent chiral centers were obtained by chirality pairing. Mechanistic studies were conducted to understand the high levels of