Highly selective copper-catalyzed trifunctionalization of alkynyl carboxylic acids: an efficient route to bis-deuterated β-borylated α,β-styrene

A copper-catalyzed highly efficient protocol for the synthesis of bis-deuterated β-borylated α,β-styrene derivatives from alkynyl carboxylic acids and B₂pin₂ has been achieved by employing readily available and cheap D₂O as a deuterium source under base-free conditions at ambient temperature.