In Quest of a Prismene. Organolithium-Induced Desulfonylation on Strained Hydrocarbons
作者:Rolf Gleiter、Frank Ohlbach
DOI:10.1021/jo960327b
日期:1996.1.1
Reaction of a twofold excess of n-butyllithium with 1,6-bis(tert-butylsulfonyl)tetracyclo[4.2.0.0(5,7)]-octane (14) yields a mixture of 3- and 5-n-butyl-2-(tert-butylsulfonyl)bicyclo[2.2.2]octa-2,5-dienes 15 and 16, respectively, while the reaction with 2,3-bis(tert-butylsulfonyl)quadricyclane (11) leads to 5-n-butyl-2-(tert-butylsulfonyl)bicyclo[2.2.1]hepta-2,6-diene (24), and the reaction with 2-(tert-butylsulfonyl)hexacyclo [9.5.0.0(1,3).0(2,10).0(3,9).0(9,11)]hexadecane (8) yields a 1:1 mixture of 15-n-butyltetracyclo[7.5.2.0.0(2,8)] hexadeca-2(8),15-diene (34) and 1-n-butyl-2,3:4,5-dipentanobenzene (35). Common to all three reactions is the elimination of tert-butylsulfinate and the addition of a butyllithium moiety. A radical mechanism is suggested rather than an elimination via a strained double bond incorporated in a strained cage system.