(2-Pyridyl)sulfonyl Groups for<i>ortho</i>-Directing Palladium- Catalyzed Carbon-Halogen Bond Formation at Functionalized Arenes
作者:Johan Guilbaud、Marine Labonde、Hélène Cattey、Sylvie Contal、Christian Montalbetti、Nadine Pirio、Julien Roger、Jean-Cyrille Hierso
DOI:10.1002/adsc.201700858
日期:2017.11.10
We describe an efficient palladium‐catalyzed selective C–H ortho‐monohalogenation (X=I, Br, Cl, F) of various functionalized (2‐pyridyl)arylsulfones. ortho‐, meta‐ and para‐functionalization is tolerated at the arene group which undergoes C–H halogenation. Some modifications are also possible on the 2‐(arylsulfonyl)heteroaryl directing groups. A comparison of the halogenation efficiency suggests that
我们描述了各种功能化的(2-吡啶基)芳基砜的有效钯催化的选择性CH邻位单卤化(X = I,Br,Cl,F)。在经历C–H卤代反应的芳烃基团上,邻位,间位和对位官能化是可以容忍的。对2-(芳基磺酰基)杂芳基导向基团也可能进行一些修饰。卤化效率的比较表明,溴化是实际的选择方法,而氯化和氟化是可能的,但更具挑战性。在强迫条件下,也可以实现邻二卤化。