1,2-Diaza-3,5-diborolidine CH2BR1-(NR2)2-BR1: Potentielle Vorstufen zu cyclischen Diborylcarben-Liganden
作者:Lothar Weber、Jan Benjamin Förster、Hans-Georg Stammler、Beate Neumann
DOI:10.1002/zaac.201100322
日期:2011.10
The reaction of the aminohaloboranes (Me2N)(R)BX (1) (a: R = Ph, X = Cl; b: R = Me, X = Br; c: R = iPr, X = Cl) with the di-Grignard reagent (BrMg)2CH2 in ethyl ether/benzene mixtures afforded the diborylmethanes [(Me2N)(R)B]2CH2 (2) (a: R = Ph; b: R = Me; c: R = iPr), which were subsequently converted into the corresponding bis(chloroboryl)methanes [(Cl)(R)B]2CH2 (3) (a: R = Ph; b: R = Me; c: R =
氨基卤代硼烷 (Me2N)(R)BX (1) (a: R = Ph, X = Cl; b: R = Me, X = Br; c: R = iPr, X = Cl) 与二-乙醚/苯混合物中的格氏试剂 (BrMg)2CH2 得到二硼基甲烷 [(Me2N)(R)B]2CH2 (2)(a:R = Ph;b:R = Me;c:R = iPr)随后转化为相应的双(氯硼基)甲烷 [(Cl)(R)B]2CH2 (3)(a:R = Ph;b:R = Me;c:R = iPr)。3a–c 与 1,2-二异丙基肼的碱辅助环缩合反应得到 1,2-二异丙基-1,2-二氮杂-3,5-二有机-3,5-二硼烷 (4) (a: R = Ph; b: R = Me;c:R = iPr)。衍生物4a用双(三甲基甲硅烷基)酰胺钾去质子化,得到(1,2-二异丙基-1,2-二氮杂-3,5-二苯基-3,5-二硼烷基)钾(5)。尝试通过用碘或