Precise Control of Regioselective and -Alkylation of Benzotriazoles with α-Diazoacetates by Metalloporphyrin.

Regioselective -alkylation of benzotriazole is highly important to prepare biological materials. Herein, a series of AB-typed porphyrin and metalloporphyrin compounds were prepared. Catalytic results disclosed that Ir(III) pentafluorophenyl-substituted porphyrin promoted selective -alkylation of benzotriazole, and meanwhile, Fe(III) pyridine-substituted porphyrin accelerated -alkylation of benzotriazole. The metalloporphyrin could be used as a linker and inserted into a two-dimensional metal-organic framework; the resultant composite behaved as a heterogeneous catalyst, which could be recycled and reused for at least 6 times without any decrease of activity. This work demonstrates that the introduction of appropriate functional groups into metalloporphyrin at the meso-position is an effective strategy to regulate the reactivity and selectivity of substitution of benzotriazoles.