hydroboration of 1,4-cyclooctadiene with 1a–c leads to mixtures of products containing both the 9-borabicyclo[3.3.1]nonane (6a–c) and the 9-borabicyclo[4.2.1]nonane derivative (7a–c). In the case of the reaction of 1d with 1,4-cyclooctadiene, the 9-(N-carbazolyl)-9borabicyclo[4.2.1]nonane 7d is formed selectively. The reaction of the corresponding tetraalkyldiboranes(6) with the azoles gives the boracyclopentane
异戊二烯在THF [az-BH 2 -THF:az = N-
吡咯基(1a),N-
2,5-二甲基吡咯基(1b),N-
吲哚基(1c),N-
咔唑基(1d)]提供了
硼环戊烷衍
生物2a–d。在2b,c的情况下,具有分别连接于
硼原子的2,5-二甲基
吡咯烷基和2,3-二氢
吲哚基的还原物种3b,c也作为副产物存在。1,4-
环辛二烯与1a–c的氢
硼化反应会生成既包含9-borabicyclo [3.3.1]
壬烷(6a–c)又包含9-borabicyclo [4.2.1]
壬烷衍
生物(7a–c)的混合物)。在1d与1,4-
环辛二烯反应的情况下,选择性地形成9-(N-
咔唑基)-9
硼环[4.2.1]
壬烷7d。相应的四烷基二
硼烷(6)与
吡咯的反应得到的
硼环戊烷衍
生物2和4的纯度更高,在(H-9-BBN)2的情况下,所有9-(N-偶氮基)-9-
硼环[ 3.3.1]
壬烷6a-d作为唯一产品获得。