Palladium-catalyzed direct C–H arylation of 3-aryl-2H-benzo[1,2,4]thiadiazine 1,1-dioxides: an efficient strategy to the synthesis of benzothiadiazine-1,1-dioxide derivatives
作者:Dongyin Wang、Wei Liu、Fei Yi、Yongli Zhao、Junmin Chen
DOI:10.1039/c5ob02196k
日期:——
A new palladium-catalyzed benzothiadiazine-1,1-dioxide direct arylation of C(sp2)–H bonds is described. 3-Aryl-2H-benzo[1,2,4]thiadiazine 1,1-dioxides react with various aryl iodides to give the corresponding mono-arylation products 3-(biphenyl-2-yl)-2H-benzo[1,2,4]thiadiazine 1,1-dioxides with high reactivity and regioselectivity in the presence of AgOAc. Remarkedly, the addition of TFA is crucial
描述了一种新的钯催化的C(sp 2)-H键的苯并噻二嗪-1,1-二氧化物直接芳基化。3-芳基-2 H-苯并[1,2,4]噻二嗪1,1-二氧化物与各种芳基碘反应生成相应的单芳基化产物3-(联苯基-2-基)-2 H-苯并[1 ,2,4]噻二嗪1,1-二氧化物在AgOAc存在下具有高反应活性和区域选择性。值得注意的是,添加TFA对于提高芳基化收率至关重要。