作者:Mathieu Achard、Marc Mosrin、Alphonse Tenaglia、Gérard Buono
DOI:10.1021/jo052630v
日期:2006.3.31
The cobalt-catalyzed [6+2] cycloaddition of cyclooctatetraene 1 with alkynes 3 affords monosubstituted bicyclo[4.2.2]deca-2,4,7,9-tetraenes 4 in fair to good yields. Due to the valence tautomerism, 1,3,5-cyclooctatriene 2, in equilibrium with bicyclo[4.2.0]octa-2,4-diene A, and alkynes 3 are converted to 10 and 11 according to [6+2] and [4+2] cycloadditions, respectively.
环辛酸酯1与炔3进行钴催化的[6 + 2]环加成反应,可以公平地获得良好收率的单取代双环[4.2.2] deca-2,4,7,9-四烯4。由于价互变异构,与双环[4.2.0] octa-2,4-二烯A平衡的1,3,5-环辛三烯2和炔烃3根据[6 + 2]转化为10和11分别有[4 + 2]个环加成。