87073-75-4Relevant articles and documents
Double Capture of Difluorocarbene by 2-Aminostyrenes Enables the Construction of 3-(2,2-Difluoroethyl)-2-fluoroindoles
Sheng, Heyun,Su, Jianke,Li, Xin,Li, Xue,Song, Qiuling
supporting information, p. 7781 - 7786 (2021/10/25)
We report herein an efficient strategy to construct 3-(2,2-difluoroethyl)-2-fluoroindoles from activated o-aminostyrenes with ethyl bromodi-fluoroacetate as a difluorocarbene source. Through double capture of a difluorocarbene, two different types of fluo
Chemo-, Regio-, and stereoselective trifluoromethylation of styrenes via visible light-driven single-electron transfer (SET) and triplet-triplet energy transfer (TTET) processes
Lin, Qing-Yu,Xu, Xiu-Hua,Qing, Feng-Ling
, p. 10434 - 10446 (2015/02/19)
A process for tunable and chemo-, regio-, and stereoselective photocatalytic trifluoromethylation of styrenes was developed. Thermodynamically stable E-trifluoromethylated alkenes were prepared using Tognis reagent in the presence of Ru(bpy)3Cl2·6H2O under visible light irradiation, whereas less thermodynamically stable Z-trifluoromethylated alkenes were obtained by employing Umemotos reagent and photocatalyst Ir(ppy)3.
Enantioselective syntheses of no-carrier-added (n.c.a.) (S)-4-chloro-2-[18F] fluorophenylalanine and (S) - (α-methyl) -4-chloro-2-[18F]fluorophenylalanine
Al-Darwich,Plenevaux,Lemaire,Fiore,Christiaens,Comar,Luxen
, p. 117 - 124 (2007/10/03)
(S)-4-Chloro-2-fluorophenylalanine and (S)-(α-methyl)-4-chloro-2-fluorophenylalanine were synthesized and labeled with no carrier added (n.c.a.) fluorine-18 through a radiochemical synthesis relying on the highly enantioselective reaction between 4-chloro-2-[18F]fluorobenzyl iodide and the lithium enolate of (2S)-1-(tert-butyloxycarbonyl)-2-(tert-butyl)-3-methyl-1,3-imidazolidine-4-one for (S)-4-chloro-2-[18F]fluorophenylalanine and (2S,5S)-1-(tert-butyloxycarbonyl)-2-(tert-butyl)-3,5-dimethyl-1,3-imidazolidine-4-one for (S) - (α-methyl)-4-chloro-2-[18F] fluorophenylalanine. Quantities of about 20-25 mCi were obtained at the end of synthesis, ready for injection after hydrolysis and high performance liquid chromatography (HPLC) purification, with a radiochemical yield of 17%-20% corrected to the end of bombardment after a total synthesis time of 90-105 min from [18F]fluoride. The enantiomeric excesses were shown to be 97% or more for both molecules without chiral separation and the radiochemical and chemical purities were 98% or better.