带有两个酰胺基团的苯甲酸催化剂通过内部氢键相互作用增加了羧酸部分的布朗斯台德酸度,被设计为一类新型的羧酸催化剂,用于吲哚与β-硝基苯乙烯和3,3-的Friedel-Crafts反应。双取代的3 H吲哚,以高收率获得相应的Friedel-Crafts加合物。与内部氢键结合的苯甲酸催化剂相比,苯胺酸具有较高的布朗斯台德酸度,后者基于DMSO中通过紫外分光光度滴定法测得的p K a得出。
Synthesis of 9,9′-biphenanthryl-10,10′-bis(oxazoline)s and their preliminary evaluations in the Friedel–Crafts alkylations of indoles with nitroalkenes
作者:Shuang-zheng Lin、Tian-pa You
DOI:10.1016/j.tet.2008.11.083
日期:2009.1
Chiral 9,9′-biphenanthryl-10,10′-bis(oxazoline)s 6a–d were firstly prepared. These new chiral compounds were evaluated as ligands for the Friedel–Craftsalkylations of indoles with nitroalkenes, excellent yields and modest to good enantioselectivities were achieved.
Friedel–Crafts alkylation reaction with fluorinated alcohols as hydrogen-bond donors and solvents
作者:Ren-Jin Tang、Thierry Milcent、Benoit Crousse
DOI:10.1039/c8ra01397g
日期:——
and electron-rich arenes with β-nitroalkenes in HFIP was reported. The desired products are formed rapidly in excellent yields under mild conditions without the need for any additional catalysts or reagents. Further, this methodology can be applied to one-pot synthesis of biologically active tryptamine derivatives.
据报道,在 HFIP 中吲哚和富电子芳烃与 β-硝基烯烃发生有效且清洁的 FC 烷基化。在温和条件下以优异的产率快速形成所需产物,无需任何额外的催化剂或试剂。此外,该方法可应用于生物活性色胺衍生物的一锅合成。
Enantioselective Friedel−Crafts Alkylation of Indoles with Nitroalkenes Catalyzed by Bifunctional Tridentate Bis(oxazoline)−Zn(II) Complex
作者:Shao-Feng Lu、Da-Ming Du、Jiaxi Xu
DOI:10.1021/ol060586f
日期:2006.5.1
[reaction: see text] A more practical and efficient catalytic asymmetric Friedel-Craftsalkylation of indoles with nitroalkenes using bifunctional tridentate bis(oxazoline)-Zn(OTf)(2) as catalyst has been developed. Various types of the nitroalkylated indoles were obtained in excellent yields (85-99%) and high enantioselectivities (up to 98% ee).
Asymmetric Friedel−Crafts Alkylations of Indoles with Nitroalkenes Catalyzed by Zn(II)−Bisoxazoline Complexes
作者:Yi-Xia Jia、Shuo-Fei Zhu、Yun Yang、Qi-Lin Zhou
DOI:10.1021/jo0516537
日期:2006.1.1
A novelasymmetric Friedel−Crafts alkylation of indoles with nitroalkenes catalyzed by Zn(II)−bisoxazoline complexes has been developed. The nitroalkylated indoles are synthesized in excellent yields and high enantioselectivities (up to 90% ee). The effects of ligand structure, metal salt, and solvent on the reaction are discussed. The substrates of the reaction can be aromatic, heteroaromatic, and