作者:Athelstan L.J. Beckwith、Vincent W. Bowry、Carl H. Schiesser
DOI:10.1016/0040-4020(91)80014-s
日期:1991.1
cis- and trans- isomers of 9-methyldecahydro-naphthalene, in which the former predominates, but no methylenecyclodecane. The reaction involves the extremely rapid, stereoselective transannular cyclisation of the 6-methylene-cyclodecyl radical (2b). Generation of 2b by thermolysis of the tert-butyl perester, 12b, in the presence of 1,1,3,3-tetramethylisoindolinyl-2-oxyl (T·.) gives both cyclised (15, 16)
用三丁基锡烷处理衍生自6-亚甲基环癸醇的二硫代碳酸酯10a,得到9-甲基十氢萘的顺式和反式异构体的混合物,其中前者占优势,但没有亚甲基环癸烷。该反应涉及6-亚甲基-环癸基自由基(2b)的极快的立体选择性环环化。在1,1,3,3-四甲基异吲哚基-2-氧(T·)存在下,叔丁基过酸酯12b的热解生成2b既可以环化(15、16),也可以不环化(14)) 产品。数据的通常处理得到ķ Ç ≈3×10 10小号-1在80℃下,其中ķ Ç是用于环化的速率常数2b中。