Unusually Coordinated Phosphorus Compounds; 7<sup>1</sup>. Adamant-1-ylmethylidynephosphine, A New, Stable Phosphaalkyne
作者:T. Allspach、M. Regitz、G. Becker、W. Becker
DOI:10.1055/s-1986-31467
日期:——
The reaction of tris[trimethylsilyl]phosphine (4a) as well as of the lithium bis[trimethylsilyl]phosphide·; tetrahydrofuran complex (4b) with 1-adamantoyl chloride (5) results in the formation of the phosphaalkene 7 in 67% or 96% yield, respectively. Subsequent sodium hydroxide or tetra-n-butylammonium fluoride-catalysed elimination of hexamethyldisiloxane from 7 at 20/90 °C gives rise to the phosphaalkyne 8 in 83 or 71% yield. The phosphaalkyne 8 undergoes smooth [3 + 2]cycloaddition reactions with 1,3-dipoles such as the nitrile oxide 9, the diazo compounds 12a-c, and the azide 15 to produce the phospholes 11,14a-c, and 16, respectively. The phosphaalkene 7 reacts with the dipoles 9 and 12a to give the same cycloadducts 11 and 14a, respectively. In these two reactions, the primary adducts undergo spontaneous (10 → 11) or sodium hydroxide-catalysed (13 → 14a) elimination of hexamethyldisiloxane.
三[三甲基硅基]膦 (4a) 以及双[三甲基硅基]膦锂四氢呋喃络合物 (4b) 与 1- 金刚烷酰氯 (5) 反应生成膦烃 7,收率分别为 67% 或 96%。随后,在 20/90 ℃条件下,用氢氧化钠或四正丁基氟化铵催化消除 7 中的六甲基二硅氧烷,得到膦炔 8,收率分别为 83% 或 71%。膦炔 8 与 1,3-二极(如氧化腈 9、重氮化合物 12a-c 和叠氮化物 15)发生平滑的 [3 + 2] 环加成反应,分别生成膦孔 11、14a-c 和 16。膦烯 7 与偶极 9 和 12a 反应,分别生成相同的环加成物 11 和 14a。在这两个反应中,初级加合物会自发(10 → 11)或在氢氧化钠催化下(13 → 14a)消除六甲基二硅氧烷。