Organophosphorus Compounds; 52.<sup>1</sup>Phosphatriafulvenes and Their Reactions with Electrophiles
作者:Eberhard Fuchs、Bernhard Breit、Uwe Bergsträßer、Jürgen Hoffmann、Heinrich Heydt、Manfred Regitz
DOI:10.1055/s-1991-28399
日期:——
Electrophilic reagents attack the phosphatriafulvenes 1a and 1b exclusively at the phosphorus atom. Hence 1b is methylated by methyl iodide to furnish the cyclopropenylium iodide 3 which, in turn, is converted to the triazine 6 by reaction with sodium azide. Ketenes 8 react with 1a through subsequent P → O silyl shifts to give the vinylphosphatriafulvenes 10. Isocyanates 13a and 13b behave analogously (→ 15). In the reactions of 1a with isothiocyanates 13c and 13d, in contrast, a P → N silyl shift is observed which leads to the formation of 16. Acetylenedicarboxylates 17 undergo insertion into the P/Si bond of the silylated phosphatriafulvene 1a (→ 19). In the case of the reaction of the mesitylsubstituted phosphatriafulvene 1b with 17, kinetically controlled formation of the dihydrooxophosphinines 20 takes place; at room temperature, the latter products undergo slow rearrangement to give the thermodynamically more stable isomers 21.
亲电试剂只攻击磷杂富烯 1a 和 1b 的磷原子。因此,1b 被碘甲烷甲基化,生成碘化环丙烯鎓 3,而碘化环丙烯鎓 3 又通过与叠氮化钠反应转化为三嗪 6。 烯酮 8 通过随后的 P → O 硅移与 1a 反应,得到乙烯基磷杂富烯 10。异氰酸酯 13a 和 13b 的表现类似(Æ 15)。相反,在 1a 与异硫氰酸酯 13c 和 13d 的反应中,观察到 P → N 硅转移,从而生成 16。乙酰二羧酸盐 17 会插入硅烷基化磷脂酰氟 1a 的 P/Si 键中(→19)。在间苯二酚取代的磷杂富烯 1b 与 17 反应的情况下,二氢氧膦 20 在动力学控制下形成;在室温下,后一种产物发生缓慢重排,生成热力学上更稳定的异构体 21。