Iron‐Catalyzed Intermolecular Azidabenzoyl Difluoromethylation of Alkenes to Access
β
‐Difluoroacyl Azides
摘要:
AbstractA Fe(II)‐catalyzed three‐component reaction of 2‐iodo‐2,2‐difluoroacetophenones, alkenes and TMSN3 is described, which provides a particularly valuable route to access difluoroalkylated azides with high yields. The method permits the efficient azidation of varied β‐difluoroacyl‐benzylic radicals in mild conditions with high functional group tolerance. Preliminary mechanistic investigation indicated that a radical‐mediated process was involved in this azidadifluoroacylation reaction.
Detrifluoroacetylation Reaction of Trifluoromethyl-β-diketones: Facile Method for the Synthesis of Succinimide Derivatives and 1,4-Diketones
作者:Li-Hua Wang、Jing Zhao
DOI:10.1002/ejoc.201800680
日期:2018.8.23
A detrifluoroacetylation of trifluoromethyl‐β‐diketones has been developed, which allows for the synthesis of succinimides and 1,4‐diketones through cascade Michael addition/retro‐Claisen reaction and nucleophilic substitution/retro‐Claisen reaction.
Cu(I)‐catalyzed three‐component reaction of 2‐iodo‐2,2‐difluoroacetophenones, alkynes, and TMSCN for the synthesis of useful difluoroacyl‐substituted nitriles is described. This method has broad substrate scope and excellent stereoselectivity. Preliminary mechanistic investigation indicated that a radical‐mediated process was involved in this cyanodifluoroalkylation reaction.
with excellent stereoselectivity. The 1‐benzoyldifluoromethyl‐2,2‐diphenylethylene products synthesized through a radical reaction process are versatile synthons for the construction of various fluorine‐containing compounds, which have antiproliferative activity on human tumor cells.
A palladium catalyzed Negishi-type α-arylation of α-fluoroketones with electron-rich and electron-deficient aryl halides or phenyl triflate has been developed. This direct mono-α-arylation method generate a variety of ternary α-aryl-α-monofluoroketones easily in good to excellent yields using XPhos as ligand and Cs2CO3 as mild base.
已经开发了钯催化的α-氟代酮的Negishi型α-芳基化反应,该反应具有富电子和电子不足的芳基卤化物或三氟甲磺酸苯酯。使用XPhos作为配体和Cs 2 CO 3作为温和的碱,这种直接的单α-芳基化方法可以轻松地以良好或优异的产率生成各种三元α-芳基-α-单氟酮。