N-Substituted trifluoroacetimidoyl halides in ionic-type transformations readily undergo nucleophilic substitution and dehydrofluorination rather than 1,3-dehydrohalogenation to give nitrile ylides.
N-Substituted trifluoroacetimidoyl halides in ionic-type transformations readily undergo nucleophilic substitution and dehydrofluorination rather than 1,3-dehydrohalogenation to give nitrile ylides.
induced cyclization of so-formed (3-aminoallenyl)phosphonium salts. While the mentioned alkynyl trifluoromethyl N-methyl-ketimines were obtained by copper-catalyzed cross-coupling of terminal alkynes and N-methyl-2,2,2-trifluoroacetimidoyl chloride, terminal alkynes and N-benzyl-2,2,2-trifluoroacetimidoyl chloride under the same reaction conditions furnished 2,3-disubstituted 5-CF3-pyrroles directly
iminium salt, N,N‐dimethyl 3‐phenyl‐1‐trifluoromethyl‐propyne iminium triflate, with electron‐rich heteroaromatic ring systems (furans, thiophenes, pyrroles) are reported. The 1‐CF3‐propyne iminium ion can act as a highly reactiveambident electrophile, giving rise to simple electrophilic heteroaromatic ring substitution products, and as a 1,3‐biselectrophile leading to C2+C3‐CF3 annulation products
据报道,新型丙炔亚胺盐,N,N-二甲基3-苯基-1-三氟甲基-丙炔亚胺三氟甲磺酸盐与富电子杂芳族环系统(呋喃,噻吩,吡咯)的反应。1-CF 3-丙炔亚胺离子可充当高反应性的亲电体,从而产生简单的亲电杂芳族环取代产物,并成为导致C 2 + C 3 -CF 3环化产物的1,3-双亲电体。
Sigmatropic isomerizations in azaallyl systems: XXI. Alkanimidoylphosphonates and their prototropic and phosphorotropic isomers
作者:P. P. Onys’ko、T. V. Kim、E. I. Kiseleva、A. D. Sinitsa
DOI:10.1007/s11176-005-0110-8
日期:2004.12
Synthetic procedures for alkanimidoylphosphoryl derivatives with α-hydrogen atoms in the N-alkyl radical are developed. Data on the effect of substituents at the carbon and phosphorus atoms on the facility of prototropic transitions in the C=N-C triad are summarized. The most facile proton transfer occurs in the N-benzyl derivatives, and the prototropic isomer is the more stable, the stronger the electron-acceptor power of the substituent at the sp 3-carbon atom of the azaallyl triad. The proton transfer in N-(α-phenethyl)-trifluoroacetimidoylphosphonates proceeds selectively, which allows preparation of enantiomerically enriched derivatives of α-aminotrifluoroethylphosphonic acid. A specific effect of substituents at the phosphorus atom on the prototropism attendant on phosphorylation of imidoyl chlorides is demonstrated.
Reactions of N-alkyl- and N-aryltrihalogenoacetamides with phosphorus pentachloride
作者:A. D. Sinitsa、A. A. Shalimov、A. M. Nesterenko、D. M. Malenko
DOI:10.1007/s11172-005-0316-2
日期:2005.3
the study of reactions of N-alkyl- and N-aryltrihalogenoacetamides with PCl5, it was demonstrated for the first time that 3-alkyl(aryl)-2,2,2,4 tetrachloro-4-trihalomethyl-1,3,2-λ5-oxazaphosphetanes are intermediates in the synthesis of trihaloacetimidoyl chlorides. According to quantum-chemical calculations, acyclic N-tetrachlorophosphoranes, which are the primary products in the reactions of trihaloacetamides