Copper-catalyzed addition of diboron reagents to α,β-acetylenic esters: efficient synthesis of β-boryl-α,β-ethylenic esters

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Abstract
The efficient copper-catalyzed addition reaction of bis(pinacolato)diboron to α,β-acetylenic esters has been developed, which produces the corresponding β-borylated-α,β-ethylenic esters in high yields under mild reaction conditions.