Copper-catalyzed propargylation of diborylmethane

A Cu/PPh3-catalyzed propargylic substitution reaction of diboryl-methane is reported. Different substituted propargyl electrophiles can be employed in this reaction, and various synthetic valuable functional groups can be tolerated. Di-deuterated diborylmethane can also be used under these conditions and generates a-deuterated alkylboronic esters in good yield.