Reaction of HP(OC<sub>6</sub>H<sub>4</sub>NH)<sub>2</sub>with<i>n</i>-BuLi and then with EX (E = Me, SiMe<sub>3</sub>, GeMe<sub>3</sub>, SnMe<sub>3</sub>, Cp(CO)<sub>2</sub>Fe, Cp(CO)ICo; X = Cl, I), Leading to Selective Deprotonation and Substitution
作者:Kazuyuki Kubo、Hiroshi Nakazawa、Yukihiro Ogitani、Katsuhiko Miyoshi
DOI:10.1246/bcsj.74.1411
日期:2001.8
The reaction of HP(OC6H4NH)2 with n-BuLi yielded the amide anion, HP(OC6H4NH)(OC6H4N−), with selective deprotonation at the nitrogen atom. Subsequent treatment of the anion with MeI yielded P-methylated phosphoranes: MeP(OC6H4NH)2 and MeP(OC6H4NH)(OC6H4NMe). In contrast, the reaction of the amide with ECl (E = SiMe3, GeMe3, SnMe3) led exclusively to N-substituted phosphoranes: HP(OC6H4NH)(OC6H4NE) and HP(OC6H4NH)2. In the corresponding reaction with (η5-C5H5)(CO)2FeCl, the anion was converted into a P-metalated phosphorane, (η5-C5H5)(CO)2FeP(OC6H4NH)2}, whereas the reaction with (η5-C5H5)(CO)CoI2 yielded an N-metalated phosphorane, HP(OC6H4NH)(OC6H4NCo(η5-C5H5)(CO)I}]. The reason for such selectivity was discussed.
HP(OC6H4NH)2 与 n-BuLi 反应产生酰胺阴离子 HP(OC6H4NH)(OC6H4N−),氮原子选择性去质子化。随后用MeI处理阴离子产生P-甲基化正膦:MeP(OC6H4NH)2和MeP(OC6H4NH)(OC6H4NMe)。相比之下,酰胺与ECl (E = SiMe3、GeMe3、SnMe3) 的反应仅生成N-取代的正膦:HP(OC6H4NH)(OC6H4NE) 和HP(OC6H4NH)2。在与 (η5-C5H5)(CO)2FeCl 的相应反应中,阴离子转化为 P-金属化正膦,(η5-C5H5)(CO)2FeP(OC6H4NH)2},而与 (η5- C5H5)(CO)CoI2 产生 N-金属化正膦,HP(OC6H4NH)(OC6H4NCo(η5-C5H5)(CO)I}]。讨论了这种选择性的原因。