作者:Michinori Takeshita、Hirohisa Tsuzuki、Masashi Tashiro
DOI:10.1246/bcsj.65.2076
日期:1992.8
The treatment of dimethoxy[n]paracyclophanes (n = 7–12) (5), [2]paracyclo[2]thiophenophane (13), and dimethoxy[2.2]paracyclophane (8) with CAN in MeCN–water afforded 2,4-cyclohexadien-1-ones 9, [8]paracyclophanedione 10, the ring-opened esters 11, and ketones 12. When the n value of 5 was 7, 8, or 9, rearrangement of the methylene bridge occurred and 9 was obtained as the main products. With the n value of 12, quinone 10 was the main product. Whereas, treatment of 13 with CAN afforded the ring-opened ester 14 as the sole product. These results show that formation of 9 is dependent on the strain of the paracyclophanes. Epoxide A was proposed as an intermediate of these reactions.
在甲腈-水中用 CAN 处理二甲氧基[n]对二环庚烷(n = 7-12)(5)、[2]对二环[2]噻吩烷(13)和二甲氧基[2.2]对二环庚烷(8),可得到 2,4-环己二烯-1-酮 9、[8]对二环庚二酮 10、开环酯 11 和酮 12。当 5 的 n 值为 7、8 或 9 时,亚甲基桥发生重排,主要产物为 9。当 n 值为 12 时,主要产物为醌 10。而用 CAN 处理 13 时,唯一的产物是开环酯 14。这些结果表明,9 的形成取决于对位环烷的应变。环氧化物 A 被认为是这些反应的中间产物。