Photocycloaddition Reactions of 5,5-Dimethyl-3-(3-methylbut-3-en-1-ynyl)cyclohex-2-en-1-one
作者:Inga Inhülsen、Jürgen Kopf、Paul Margaretha
DOI:10.1002/hlca.200890044
日期:2008.3
The title cyclohexenone 1d undergoes photodimerization selectively at the exocyclic CC bond to give a 1 : 1 mixture of 1,2-dialkynyl-1,2-dimethylcyclobutanes 6 and 7. On irradiation in the presence of 2,3-dimethylbuta-1,3-diene, 1d affords bicyclo[8.4.0]tetradeca-1,2,3,7-tetraen-11-one 9. This – formal – (6+4)-cycloadduct undergoes quantitative isomerization to 3-cycloheptadienyl-2,5,5-trimethylcyclohex-2-enone
标题环己烯酮1D在环外CC键经历光二选择性,得到的1:1,2- dialkynyl -1,2- dimethylcyclobutanes 1混合物6和7。在2,3-二甲基丁-1,3-二烯存在下进行辐照时,1d得到双环[8.4.0] tetradeca-1,2,3,7-tetraen-11-one 9。用碱性硅胶处理后,该(6 + 4)-环加合物发生定量异构化为3-环庚二烯基-2,5,5-三甲基环己-2-烯酮11。