N-Substituted trifluoroacetimidoyl halides in ionic-type transformations readily undergo nucleophilic substitution and dehydrofluorination rather than 1,3-dehydrohalogenation to give nitrile ylides.
Sigmatropic Isomerizations in Azaallyl Systems: XXII. 1,3-Proton Transfer in (N-Alkyltrifluoroacetimidoyl)phosphonates
作者:P. P. Onys'ko、T. V. Kim、E. I. Kiseleva、Yu. M. Pustovit、A. D. Sinitsa
DOI:10.1007/s11176-005-0395-7
日期:2005.8
The reaction of N -alkyltrifluoroacetimidoyl chlorides with trialkyl phosphites leads to corresponding imidoylphosphonates CF3C[P(O)(OAlk)2]=NCH2R. These compounds undergo irreversible 1,3-H shift catalyzed by nitrogenous bases to give phosphorylated imines CF3CH[P(O)(OAlk)2]N=CHR. The tendency for prototropism increases with increasing electronegativity of substituents R: CF3 > CH2OMe > H > Me. N
的反应 Ñ -alkyltrifluoroacetimidoyl氯化物与三烷基亚磷酸酯通向相应imidoylphosphonates CF 3 C [P(O)(OAlk)2 ] = NCH 2 R.这些化合物经历由含氮碱基催化不可逆的1,3--H移位,得到磷酸化的亚胺CF 3 CH [P(O)(OAlk)2 ] N = CHR。随着取代基R:CF 3 > CH 2 OMe> H> Me的电负性的增加,原质性的趋势增加。 所获得的化合物的 N- 环戊基类似物没有显示出质变倾向。酰亚胺基膦酸酯主要以 Z 异构体的形式存在[ Z / E〜 (6-10):1]。
Bourne et al., Journal of the Chemical Society, 1952, p. 4014,4017
作者:Bourne et al.
DOI:——
日期:——
THE NITRATION OF WEAKLY BASIC SECONDARY AMINES
作者:R. H. MEEN、GEORGE F WRIGHT
DOI:10.1021/jo01368a017
日期:1954.3
——
作者:D. V. Romanov、N. V. Vasil"ev、G. V. Zatonsky
DOI:10.1023/a:1013046804682
日期:——
N-Substituted trifluoroacetimidoyl halides in ionic-type transformations readily undergo nucleophilic substitution and dehydrofluorination rather than 1,3-dehydrohalogenation to give nitrile ylides.