α-Halogenoacetanilides as Hydrogen-Bonding Organocatalysts that Activate Carbonyl Bonds: Fluorine versus Chlorine and Bromine
作者:Sylvain Koeller、Coralie Thomas、Fréderic Peruch、Alain Deffieux、Stéphane Massip、Jean-Michel Léger、Jean-Pierre Desvergne、Anne Milet、Brigitte Bibal
DOI:10.1002/chem.201303662
日期:2014.3.3
α‐Halogenoacetanilides (X=F, Cl, Br) were examined as H‐bonding organocatalysts designed for the double activation of CO bonds through NH and CH donor groups. Depending on the halide substituents, the double H‐bond involved a nonconventional CH⋅⋅⋅O interaction with either a HCXn (n=1–2, X=Cl, Br) or a HCAr bond (X=F), as shown in the solid‐state crystal structures and by molecular modeling. In
α-卤代乙酰乙酰苯胺(X = F,Cl,Br)作为氢键有机催化剂被设计用于通过NH和CH供体基团双重激活CO键。取决于取代基卤化物,双H键涉及非常规ç 与任一ħH⋅⋅⋅O相互作用 CX Ñ(Ñ = 1-2,X =氯,溴)或ħ Ç氩键(X = F),如固态晶体结构和分子建模所示。此外,α-halogenoacetanilides的催化性能在丙交酯的开环聚合进行了评价,在叔胺作为助催化剂的存在下进行。α-二氯和含有向CO键,得到最有吸引力的双H粘接性能缺电子芳族基团,具有Nα-dibromoacetanilides H⋅⋅⋅O⋅⋅⋅H CX 2相互作用。