the corresponding 9,10-dibromotricyclo [6.3.1.0(2,7)] dodeca-2,4,6,9-tetraene (14). Treatment of 14 with tert-butyllithium in THF at -78 degrees C produces the strained bicyclic alkyne (10) which is trapped by 1,3-diphenylisobenzofuran to give two isomeric cycloadducts 12a and 12b. The adducts 12a and 12b were found to readily rearrange to the isomeric ketones 19a and 19b upon chromatography. Upon treatment
10-
溴三环[6.3.1.0(2,7)] dodeca-2,4,6,9-四烯(8)的高温
溴化作用主要导致形成两个异构的三
溴化物(16和17),它们用
DBU脱氢
溴化得到相应的9,10-二
溴三环[6.3.1.0(2,7)] dodeca-2,4,6,9-四烯(14)。在-78℃下用
叔丁基锂在THF中处理14,得到应变的双环
炔烃(10),其被1,3-二苯基
异苯并呋喃捕获,得到两个异构的环加合物12a和12b。发现加合物12a和12b在色谱上容易重新排列为异构体酮19a和19b。用
叔丁醇钾处理后,加合物12a和12b进行碱催化的双键异构化,得到四种产物20-23。此外,