Diastereocontrol of nucleophilic attack of the rubanone carbonyl group via remote siloxy tether. Establishing the natural configuration at carbon C-3 of Cinchona alkaloids
作者:Peter Langer、H.M.R. Hoffmann
DOI:10.1016/s0040-4020(97)00609-1
日期:1997.7
Ginchona alkaloid derivatives with natural configuration at C-3 have been constructed by Grignard reaction of protected rubanone 1-TBDS. The organomagnesium regent attacks preferentially from the sterically more hindered endo face. Even L-Selectride(R) reacts endo-selectively (9 : 1). (C) 1997 Elsevier Science Ltd.