Preparation of 1,3-Functionalized Adamantanes by the Lewis Acid Catalyzed Electrophilic Cyclization of 7-Methylenebicyclo[3.3.1]nonan-3-one in the Presence of π- and<i>N</i>-Nucleophiles
作者:George A. Olah、Ramesh Krishnamurti、G. K. Surya Prakash
DOI:10.1055/s-1990-26967
日期:——
Preparation of 1,3-difunctionalized adamantane derivatives from 7-methylenebicyclo[3.3.1] nonane-3-one (1) in the presence of nucleophiles under Lewis acid catalysis is described. Reaction of 1 with benzene using a variety of Lewis acid catalysts gave 1,3-diphenyladamantane (4) as the major product. Trimethylsilyl cyanide and azide efficiently reacted with 1 in the presence of zinc iodide as the catalyst to give good yields of the corresponding 3-trimethylsiloxyadamantyl isocyanide and azide, respectively. Trimethylsilyl isothiocyanate gave a 1:1 mixture of the thiocyanate and isothiocyanate derivatives. Silyl enol ethers, such as those of acetophenone and cyclopentanone, and allyltrimethylsilane also reacted with 1 to afford the corresponding 1,3-difunctionalized adamantanes.
介绍了在路易斯酸催化下,由 7-亚甲基双环[3.3.1]壬烷-3-酮(1)在亲核剂存在下制备 1,3-二官能化金刚烷衍生物的过程。 在多种路易斯酸催化剂的作用下,1 与苯反应得到的主要产物是 1,3-二苯基金刚烷(4)。在碘化锌作为催化剂的情况下,三甲基硅基氰化物和叠氮化物能有效地与 1 反应,分别得到相应的 3-三甲基硅氧基金刚烷异氰酸酯和叠氮化物,收率很高。异硫氰酸三甲基硅酯可得到硫氰酸盐和异硫氰酸盐衍生物 1:1 的混合物。硅烯醇醚(如苯乙酮和环戊酮的硅烯醇醚)和烯丙基三甲基硅烷也能与 1 反应,生成相应的 1,3-二官能化金刚烷。