Alkenylsilanes bearing chlorosilyl and boryl groups geminally attached to a carbon atom ((E)-3-(9-borabicyclo[3.3.1]nonan-9-yl)-N,N-dimethyl-3-(trichlorosilyl)prop-2-en-1-amine, 1, (1-(9-borabicyclo[3.3.1]nonan-9-yl)-3,3-dimethylbut-1-en-1-yl)dichloro (phenyl)silane, 2, (1-(9-borabicyclo[3.3.1]nonan-9-yl)-2-phenylvinyl) chloro (methyl)(phenyl)silane, 3, (1-(9-borabicyclo[3.3.1]nonan-9-yl)hex-1-en-1-yl)trichlorosilane, 4) are accessible by hydroboration of the corresponding alkynylsilanes. Only the vinyl group of 1 adopted E configuration, which may be favored by ring closure via an intramolecular B–N bonding interaction. Compounds 2–4 reacted with N-trimethylsilylpyrazole and N-2-(trimethylsilylamino)pyridine by elimination of ClSiMe₃ and formation of Si–N bonds. Intramolecular donor–acceptor interactions between the N and B atoms afforded five- and six-membered heterocycles, which contained Si, N, and B as heteroatoms. A bis(pyrazolyl)silane was isolated upon treatment of a dichlorosilane with two equivalents of trimethylsilylpyrazole.

中文翻译：

---

炔基氯硅烷的硼氢化反应是合成 SiNNB 杂环的有效途径

带有氯甲硅烷基和硼基的链烯基硅烷与碳原子 (( E )-3-(9-硼双环 [3.3.1]nonan-9-yl) -N , N-二甲基-3-(三氯甲硅烷基)prop-2- en-1-胺，1，(1-(9-硼双环[3.3.1]壬烷-9-基)-3,3-二甲基丁-1-烯-1-基)二氯(苯基)硅烷，2，( 1-(9-硼双环[3.3.1]壬烷-9-基)-2-苯基乙烯基)氯(甲基)(苯基)硅烷，3，(1-(9-硼双环[3.3.1]壬烷-9-基) )己-1-烯-1-基)三氯硅烷，4 )可通过相应炔基硅烷的硼氢化反应获得。只有1的乙烯基采用E构型，这可能有利于通过分子内 B-N 键相互作用的闭环。化合物2 - 4与反应Ñ -trimethylsilylpyrazole和Ñ通过ClSiMe消除-2-（三甲基甲硅烷基）吡啶₃和形成Si-N键。N 和 B 原子之间的分子内供体-受体相互作用提供了五元和六元杂环，其中包含 Si、N 和 B 作为杂原子。在用两当量的三甲基甲硅烷基吡唑处理二氯硅烷后分离出双(吡唑基)硅烷。