Abstract
The reactivity of 1,2-dihalobenzenes in palladium-catalyzed C–H bond functionalization
is more difficult to control than that of 1,3- and 1,4-dihalobenzenes because of a
possible Pd 1,4-migration during the second catalytic cycle. With C3-substituted heteroarenes
this 1,4-palladium migration is not possible and the reaction allows the synthesis
of a wide variety of functionalized 1,2-heteroarylated benzene derivatives in high
yields. Conversely, only a few heteroarenes with a free C3 position, such as thiazoles,
furans and imidazoles, allow the preparation of 1,2-heteroarylated benzenes. Despite
these limitations, this one-pot procedure employing an easily available catalyst [Pd(OAc)2] and an inexpensive base (KOAc) provides a very simple method for the preparation
of several 1,2-heteroarylated benzenes.
Key words
C–H functionalization - 1,2-dihalobenzenes - heteroarenes - homogeneous catalysis
- palladium