Convenient protocols for Mizoroki–Heck reactions of aromatic bromides and polybromides with fluorous alkenes of the formula H<sub>2</sub>CCH(CF<sub>2</sub>)<sub>n−1</sub>CF<sub>3</sub> (n = 8, 10)
作者:Haw-Lih Su、Janos Balogh、Mohammed Al-Hashimi、Dave G. Seapy、Hassan S. Bazzi、John A. Gladysz
DOI:10.1039/c6ob01980c
日期:——
average isolated yield). Typically, 1.2–2.4 equiv. of alkene are employed per Ar–Br bond, together with Pd(OAc)2 catalyst (4–5 mol%/Ar–Br bond), n-Bu4N+ Br− (0.8–1.0 equiv./Ar–Br bond), NaOAc (1.2–2.4 equiv./Ar–Br bond), and 3 : 1 w/w DMF/THF as solvent (120 °C). No effort is necessary to exclude air or moisture, and reactions may be conducted on >10 g scales. Only E isomers of the products Ar(CHCHRfn)m
氟代烯烃H 2 C CHR f n(R f n =(CF 2)n -1 CF 3;n = 8、10)与各种芳族单溴化物和多溴化物(例如1,3-)一起进行Mizoroki-Heck反应和1,4-C 6 H ^ 4溴2,1,3,5--C 6 H ^ 3溴3,1,3,5--C 6 H ^ 3溴2氯,1,4- XC 6 H ^ 4溴(X = CF 3,R f8,COCH 3,CN,1,4-OC 6 H 4 Br),1,2-O 2 NC 6 H 4 Br,5-溴异喹啉,5-溴嘧啶,3-溴-5-甲氧基吡啶和3,5-二溴吡啶(十六例,平均单产为78%)。通常为1.2–2.4当量。每个Ar–Br键使用1个烯烃,与Pd(OAc)2催化剂(4–5 mol%/ Ar–Br键),n -Bu 4 N + Br −(0.8–1.0当量/ Ar–Br键)一起使用),NaOAc(1.2-2.4当量/ Ar-Br键)和3:1
Efficient Access to Perfluoroalkylated Aryl Compounds by Heck Reaction
been achieved by Heck reactionbetween perfluoroalkenes and arenediazonium salts, catalysed by palladium acetate. Subsequent transition metalcatalysed hydrogenation of the doublebond afforded a large variety of aromatic compounds bearing an affinity for fluorous solvents. Formation of perfluoroalkylated phosphane ligands and their use in palladium-catalysed coupling between potassium trifluoro(vinyl)borates