1,9-Dithia-2,15-cyclohexadecadiyne Cyclization of 1,7-dibromo-2-heptanone (1) with NaHS leads to 1-thia-cyclooctanone and to the 16-membered ring system 3a. The latter is transformed to the title compound 7 via the disemicarbazone 4 and the diselenadiazole 5. Both triple bonds are introduced in the last step of the synthetic sequence by a thermal fragmentation process of the 1,2,3-selenadiazole rings.
1,9-二
硫杂-2,15-
环十六烷 1,7-二溴-2-庚酮 (1) 与 NaHS 环化生成 1-
硫杂
环辛酮和 16 元环系统 3a。后者通过二emicarbazone 4 和二
硒二唑 5 转化为标题化合物 7。在合成序列的最后一步,通过 1,2,3-
硒二唑环的热破碎过程引入了两个三键。