Diastereoselective addition of monoterpenic alcoholates and thiolates to 2,3-dicarbomethoxynorbornadiene
作者:Ivan Michieletto、Fabrizio Fabris、Ottorino De Lucchi
DOI:10.1016/s0957-4166(00)00231-7
日期:2000.7
Addition of excess lithium salts of (−)-menthol or (−)-borneol to 2,3-dicarbomethoxynorbornadiene 1 affords the transesterification–addition products 4 and 5. The thiols derived from the same monoterpenes give only the addition products to the activated double bond, 6 and 7. In all cases, the addition reaction is totally exo-selective with respect to the norbornadiene moiety and moderately selective