LAUSR

The ruthenium catalytic addition of alkenes to alkynes has been demonstrated as a powerful synthetic tool to form diene motifs and widely applied in the synthesis of complex molecules. How-ever, except for the intramolecular coupling, trisubstituted alkenes are unsatisfactory coupling partners with alkynes, presumably due to the increased steric hindrance. Herein, we discovered that the substituted vinyl 1,2-bisboronate derivatives can serve as the tri-substituted alkene equivalents to couple with alkynes, generating various boryl-substituted homoallylic alcohol motifs with good stereoselectivity through the sequential allylboration with alde-hydes. In contrast to carbon substituents on the double bond, bo-ron substituents accelerate the alkyne coupling.