Synergistic catalysis of the Brönsted acid and highly dispersed Cu on the mesoporous Beta zeolite in the intermolecular aminoazidation of styrene
作者:Wenqian Fu、Chengyou Yin、Yu Feng、Lei Zhang、Feng Cheng、Zhongxue Fang、Chaojie Zhu、Tiandi Tang
DOI:10.1016/j.apcata.2020.117907
日期:2021.1
Acidic mesoporous Beta zeolite supported Cu (Cu/Beta-M) catalyst shows superior catalytic performance in the difunctionalization of styrenes with N-fluorobenzenesulfonimide (F-N(SO2Ph)(2)) and azidotrimethylsilane, compared with basic mesoporous ETS-10-M and acid-free Silicalite-1-M support Cu catalysts. The Bronsted acid, copper species and mesoporosity in the Cu/Beta-M catalyst jointly contribute to this reaction. The Cu/Beta-M catalyst can induce the chemisorption of the styrenes through interaction of C=C bond with the Bronsted acidic sites, promoting the activation of the C=C bond. Meanwhile, the Cu species in Cu/Beta-M can catalyze F-N (SO2Ph)(2) to transform into the -N(SO2Ph)(2) electrophile, which attacks the activated C=C bond of styrenes, leading to the catalyst with high activity and product selectivity. In addition, the styrenes with electron-donating groups have high electron density of the pi-conjugated system, which can strengthen the interaction of C=C bond with the Bronsted acidic sites, leading to the substrates with high reactivity.