A General Protocol for C−H Difluoromethylation of Carbon Acids with TMSCF
<sub>2</sub>
Br
作者:Qiqiang Xie、Ziyue Zhu、Lingchun Li、Chuanfa Ni、Jinbo Hu
DOI:10.1002/anie.201900763
日期:2019.5.6
efficient method for the selective C‐difluoromethylation of carbon acids with the reagent TMSCF2Br has been developed. A variety of structurally diverse sp3‐ and sp‐hybridized carbon nucleophiles, including esters, amides, fluorenes, terminal alkynes, β‐ketoesters, malonates, and other activated C−H nucleophiles, could be efficiently and selectively transformed into the corresponding C‐difluoromethylated
已经开发出一种有效的方法,可通过试剂TMSCF 2 Br选择性地对碳进行C-二氟甲基化。各种结构多样的sp 3和sp杂化的碳亲核试剂,包括酯,酰胺,芴,末端炔烃,β-酮酸酯,丙二酸酯和其他活化的C-H亲核试剂,都可以有效地并选择性地转化为相应的C-亲核试剂。在温和条件下的二氟甲基化产物。该方案对于药物相关分子的晚期二氟甲基化也很有效,并且可以很容易地扩大规模。此外,可以使用TMSCF 2 Br对二氟卡宾具有一个以上反应位点的环境底物进行正交二氟甲基化。