1-Fluoro-1-sulfonyloxylation of Alkenes by Sterically and Electronically Tuned Hypervalent Iodine: Regression Analysis toward 1,1-Heterodifunctionalization
the heterodifunctionalization of alkenes, 1,1-regioselectivity remains elusive in sharp contrast to 1,2-regioselectivity. Herein, the 1-fluoro-1-sulfonyloxylation of styrenes with Bu4NBF4 and sulfonic acids using a hypervalent iodine ArI(OAc)2 is reported. Regression analysis of substituents on ArI(OAc)2 suggested that their electron-withdrawing ability and steric factor influence the 1,1-heterodifunctionalization
在烯烃的异双功能化中,1,1-区域选择性与 1,2-区域选择性形成鲜明对比,仍然难以捉摸。在此,报道了使用高价碘 ArI(OAc) 2对苯乙烯与 Bu 4 NBF 4和磺酸进行1-氟-1-磺酰氧基化反应。ArI(OAc) 2上取代基的回归分析表明它们的吸电子能力和空间因素影响1,1-异双功能化。我们设计了o -2,4-(CF 3 ) 2 C 6 H 3 }-和p -NO 2 -取代的ArI(OAc) 2通过回归分析实现高选择性。
Palladium-Catalyzed Cs<sub>2</sub>CO<sub>3</sub>-Promoted Arylation of Unactivated C(sp<sup>3</sup>)–H Bonds by (Diacetoxyiodo)arenes: Shifting the Reactivity of (Diacetoxyiodo)arenes from Acetoxylation to Arylation
作者:Quan Gou、Zhao-Fu Zhang、Zhi-Cheng Liu、Jun Qin
DOI:10.1021/acs.joc.5b00111
日期:2015.3.20
PdCl2(CH3CN)(2)-catalyzed arylation of unactivated C(sp(3))-H bonds using (diacetoxyiodo)arenes as arylation reagents is reported. The reactivity of (diacetoxyiodo)arenes as arylation reagents is enabled in the presence of Cs2CO3 under the reaction conditions. This arylation method is highly efficient and occurs without the use of silver salt. The reaction tolerates a broad substrate scope that was not demonstrated by other silver salt-free C(sp(3))-H bond arylation conditions. The synthetic utility of the method is further illustrated in the synthesis of the psychotropic drug phenibut. A detailed mechanism study has been conducted to understand the reaction pathway.