The Transannular Cyclization and Hydrogen Shift in the Chlorination of 1,5-Cyclooctadiene and<i>cis</i>-Cyclooctene with Antimony(V) Chloride
作者:Sakae Uemura、Akira Onoe、Masaya Okano
DOI:10.1246/bcsj.50.1078
日期:1977.5
exo-2,6-dichlorobicyclo[3.3.0]octanes (6 and 7) as additional products, besides 1 and 2. In the case of cis-cyclooctene, however, a reverse addition produces only chlorocyclooctane. It has been revealed that a mixture of 6 and 7 is readily isomerized to a mixture of 1 and 2 by the interaction with SbCl5. The 1,4-chlorination of cis-cyclooctene which gives 12 and 13 also occurs with VCl4, SeCl4, PhICl2
将 SbCl5 缓慢添加到 1,5-环辛二烯或顺式环辛烯的 CCl4 溶液中,得到内-和外-2、反-8-二氯双环[3.2.1]辛烷(1 和 2)或异构体的异构混合物反式和顺式 1,4-二氯环辛烷(12 和 13)的混合物分别以良好的收率。前一个反应涉及跨环环化,而后者伴随着跨环氢转移。将 1,5-环辛二烯添加到 SbCl5 的 CCl4 溶液中(反向添加),得到内型-2,6- 和内型、外型-2,6-二氯双环 [3.3.0] 辛烷(6 和 7)作为附加产物,除了 1 和 2。 然而,在顺式环辛烯的情况下,反向加成仅产生氯环辛烷。已经表明,通过与 SbCl5 的相互作用,6 和 7 的混合物很容易异构化为 1 和 2 的混合物。1、