5-Position-selective C–H trifluoromethylation of 8-aminoquinoline derivatives
作者:Yoichiro Kuninobu、Mitsumi Nishi、Motomu Kanai
DOI:10.1039/c6ob01325b
日期:——
We developed a copper-catalyzed 5-position-selective C–H trifluoromethylation of 8-aminoquinoline derivatives. The reaction proceeded with high functional group tolerance under mild conditions. In the case of quinolines with an amide, carbamate, urea, or sulfonamide group at the 8-position of quinoline moieties, a radical scavenger experiment indicated that the reaction proceeded via a radical pathway
trifluoromethylation of various aromatic compounds with Umemoto reagent II (2,8-difluoro-5-(trifluoromethyl)-5H-dibenzo[b,d]thiophen-5-ium triflate) proceeded in moderate to good yields under simple photo-irradiation conditions without any catalyst, additive, or activator. UV-Vis and NMR spectral analyses indicated that pre-formation of an electron donor-acceptor complex between the trifluoromethylating
Trifluoromethylation of aromatic and hetero-aromatic compounds by CF3I in the presence of Fe(II) compound, H2O2 and dimethylsulfoxide was investigated. Various trifluoromethylated benzene derivatives, six-membered nitrogen-containing aromaticcompounds and five-membered hetero-aromatic compounds were obtained under mild conditions. General orientation of electrophilic substitution of aromaticcompounds was observed
研究了在Fe(II)化合物,H 2 O 2和二甲基亚砜的存在下,CF 3 I对芳族和杂芳族化合物的三氟甲基化作用。在温和条件下获得了各种三氟甲基化苯衍生物,六元含氮芳族化合物和五元杂芳族化合物。与先前在其他自由基三氟甲基化中报道的类似,观察到芳族化合物的亲电子取代的一般取向。
N‐Trifluoromethyl Succinimide as a New Reagent for Direct C−H Trifluoromethylation of Free Anilines
We designed and prepared a trifluoromethylation reagent, N-trifluoromethylsuccinimide (NTFS), and use it for the trifluoromethylation of aromatic amines without metal. This protocol exhibits broad substrate scope and wide functional group compatibility. The synthetic utility of the method is further demonstrated by the improvedsynthesis of the antiasthmatic drug Mabuterol.