[8+2] Cycloaddition of 8-oxoheptafulvene with cycloheptatrieneFe(CO)3: synthesis of tricarbonyl[(2,3,4,5-η)-11-acetoxy-1H-cyclohept[a]azulene]iron
作者:Noboru Morita、Ryuji Yokoyama、Toyonobu Asao、Mituhiro Kurita、Shigeru Kikuchi、Shunji Ito
DOI:10.1016/s0022-328x(01)01240-2
日期:2002.1
8-Oxoheptafulvene reacted with cycloheptatrieneFe(CO)3 by [8+2] cycloaddition to give tricyclo[8.5.0.03,9]pentadeca-3,5,7,11,13-pentaene-2-oneFe(CO)3 (3), which easily reacted with another 8-oxoheptafulvene under the reaction conditions to give four products. One of them was a [2+4] cycloadduct (5) having an uncommon norcaradiene structure. Two products were [8+2] cycloadducts (6 and 7) having a γ-lactone
8-氧庚烯富烯与环庚三烯Fe(CO)3通过[8 + 2]环加成反应生成三环[8.5.0.0 3,9 ] pentadeca-3,5,7,11,13-戊烯-2-oneFe(CO)3(3),其在反应条件下容易与另一种8-氧庚基富烯反应,得到四种产物。其中之一是具有不常见的正二十碳烯结构的[2 + 4]环加合物(5)。两种产物是具有γ-内酯结构的[8 + 2]环加合物(6和7)。剩余的产物是酰化的化合物(4)。随着反应温度的升高,酰化化合物的产率增加。[1:1]环加合物3在三乙胺的存在下也与乙酰氯反应,得到乙酸盐(12),将其用邻氯苯甲酰氧化,得到11-乙酰氧基-1 H-环庚[ a ] azuleneFe(CO)3(15)。