Transannular cyclization reactions of cyclooctane-1,5-dione and 5-ethoxycarbonylmethylenecyclooctanone upon treatment with diamines. An efficient one-pot synthesis of substituted 2,6-diazatricyclo[5.3.3.01,6]- and 2,5-diazatricyclo[4.3.3.01,5]-alkanes and a study of their acetylation products
作者:Elizabeth Malamidou-Xenikaki
DOI:10.1039/p19960002523
日期:——
Cyclooctane-1,5-dione 1 undergoes transannular cyclization upon treatment with 1,2-diaminoarenes 2a–d or 1,3-diaminopropane 5a to afford the 2,5-diazatricyclo[4.3.3.01,5]dodecan-6-ols 3a–d or 2,6-diazatricyclo[5.3.3.01,6]tridecan-7-ol 6 respectively, in moderate to good yields. The ethoxycarbonylmethyldiazatricyclo analogues 22a,b result from a similar reaction of 5-ethoxycarbonylmethylenecyclooctanone 19 with diaminoalkanes 5a,b. Acetylation of tricyclo compound 3d leads, among others, to the unexpected product 2-diacetylmethylidene-1-(5-oxocyclooct-1-en-1-yl)-3-methyl-2,3-dihydrobenzimidazole 12.
环辛烯-1,5-二酮1在与1,2-二氨基芳烃2a-d或1,3-二氨基丙烷5a作用后发生跨环醇化反应,得到2,5-二氮三环[4.3.3.0^1,5]十二醇3a-d或2,6-二氮三环[5.3.3.0^1,6]十三醇6,产率为中等到良好。相似反应中,乙氧羰基甲基二氮三环类似物22a,b来源于5-乙氧羰基亚甲基环辛酮19与二氨基烷烃5a,b的反应。三环化合物3d的乙酰化反应导致意外产物2-二乙酰基亚甲基-1-(5-氧环辛-1-烯-1-基)-3-甲基-2,3-二氢苯并咪唑12的形成。