Generation and Trapping of a Highly Strained Bicyclic Alkyne: Tricyclo[6.3.1.0<sup>2,7</sup>]dodeca-2,4,6-trien-9-yne
作者:Ferhan Tümer、Yavuz Taskesenligil、Metin Balci
DOI:10.1021/jo0017537
日期:2001.6.1
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,