Synthesis of Allenyl-Bdan via Cu(I)-Catalyzed Borylation of Propargyl gem -Dichlorides.

A copper-catalyzed borylation of propargyl dichlorides was developed under mild reaction conditions. The corresponding chloro-substituted allenyl-Bdan products were obtained in good yields. The utilities of allenyl-Bdan products were examined by their diverse derivatizations.