Cul-Catalyzed Suzuki-Miyaura and Sonogashira Cross-Coupling Reactions Using DABCO as Ligand.

In the presence of TBAB, CuI-catalyzed Suzuki-Miyaura cross-coupling of vinyl halides and aryl halides with arylboronic acids was conducted smoothly to afford the corresponding diarylethenes and polyaryis in moderate to good yields using DABCO (l,4-diazabicycio[2.2.2]octane) as the ligand. We also found that the inexpensive CuI/DABCO catalytic system was effective for Sonogashira cross-couplings of aryl halides and vinyl halides. A variety of aryl halides and vinyl halides including activated aryl chlorides underwent the coupling with terminal alkynes in moderate to excellent yields. [ABSTRACT FROM AUTHOR]