A Convenient Synthesis of 7-Nitrobicyclo[2.2.1]heptane from Bicyclo[2.2.1]hept-2-ene<i>via</i>7-Aminobicyclo[2.2.1]heptane
作者:Kimitoshi Fukunaga、Christoph Rüchardt
DOI:10.1055/s-1987-28181
日期:——
syn-7-(Methoxycarbonylamino)bicyclo[2.2.1]hept-2-ene (5), prepared from bicyclo[2.2.1]hept-2-ene (1) in 52% overall yield according to literature procedures, was hydrogenated over palladized charcoal to yield 7-(methoxycarbonylamino)bicyclo[2.2.1]heptane (6). Alkaline hydrolysis of 6 gave 7-aminobicyclo[2.2.1]heptane (7), which was readily oxidized with m-chloroperoxybenzoic acid in boiling dichloroethane to 7-nitrobicyclo[2.2.1]heptane (8). The reported synthesis constitutes an efficient entry into the 7-substituted bicyclo[2.2.1]heptane series and allows for the preparation of the previously unknown nitro-derivative 8 in 23% overall yield from 1.
合成-7-(甲氧基羰基氨基)双环[2.2.1]庚-2-烯 (5)是根据文献中的方法从双环[2.2.1]庚-2-烯 (1) 制备的,总收率为 52%,在苍白木炭上氢化后得到 7-(甲氧基羰基氨基)双环[2.2.1]庚烷 (6)。碱性水解 6 得到 7-氨基双环[2.2.1]庚烷(7),在沸腾的二氯乙烷中用间氯过氧苯甲酸很容易将其氧化为 7-硝基双环[2.2.1]庚烷(8)。所报道的合成方法是进入 7-取代双环[2.2.1]庚烷系列的有效途径,并能以 23% 的总收率从 1 制备出之前未知的硝基衍生物 8。