Regioselectivity Control in Spirobifluorene Nitration under Mild Conditions: Explaining the Crivello’s Reagent Mechanism
作者:Dawod Yousif、Luca Vaghi、Constantin G. Daniliuc、Riccardo Po、Antonio Papagni、Fabio Rizzo
DOI:10.1021/acs.joc.2c02596
日期:2023.5.5
The regioselective nitration of 9,9′-spirobifluorene under mild conditions is reported for the first time by operating under Menke’s and Crivello’s conditions. The optimized protocol allows obtaining 2-nitro and 2,2′-dinitro-9,9′-spirobifluorene in yields of 79 and 95% and, for the first time, 2,2′,7-trinitro-9,9′-spirobifluorene with 66% yield. Besides, the role of dinitrate salt in Crivello’s protocol
通过在 Menke 和 Crivello 的条件下操作,首次报道了 9,9'-螺二芴在温和条件下的区域选择性硝化。优化的方案允许以 79% 和 95% 的产率获得 2-硝基和 2,2'-二硝基-9,9'-螺二芴,并且首次获得 2,2',7-三硝基-9,9'-螺二芴,产率为 66%。此外,Crivello 协议中二硝酸盐的作用现已得到阐明,这为功能材料的制备开辟了新的场景。