Alkynes　are　attractive　synthons　for　organic　chemistry.　Despite　the　prevalence　of　transition-metal-catalyzed　Sonogashira　reactions,　a　transition-metal-free　version　of　the　arylation　of　terminal　alkynes　is　elusive.　Herein,　we　report　an　efficient　transition-metal-free　Sonogashira-type　coupling　reaction　for　the　one-pot　arylation　of　alkynes　to　construct　C(sp)-C(sp2)　bonds　from　a　tetracoordinate　boron　intermediate　with　NIS　as　a　mediator.　With　its　high　efficiency,　wide　substrate　range,　and　good　functional　group　tolerance,　this　method　is　further　supported　by　the　gram-scale　synthesis　and　subsequent　modification　of　complex　molecules.