The direct heteroaromatic sp(2) C-H alkenylation of 2-substituted azole compounds with alkenes proceeds in the presence of Pd(OAc)(2) and AgOAc as catalyst and oxidant, respectively, to afford the corresponding 5-alkenylated azoles in good yields.
Diversified syntheses of multifunctionalized thiazole derivatives <i>via</i> regioselective and programmed C–H activation
The sequential construction of diversified multifunctionalized thiazole derivatives through Pd-catalyzed regioselective C-H alkenylation has been accomplished. This versatile approach provides the diversified thiazole derivatives featuring orthogonal substitution patterns at the C-2, C-4 and C-5 positions from mono-substituted (2- or 4-substituted) thiazole derivatives or even more challenging simple