Endo-2-methyl-bicyclo[2.2.1]-hept-5enyl ethyl ketone: an useful and highly stereoselective synthon for aldol reactions
作者:Mohammed Ahmar、Robert Bloch、Gérard Mandville、Isabelle Romain
DOI:10.1016/s0040-4039(00)92225-1
日期:1992.4
An excellent aldehyde diastereofacial selectivity has been observed during the aldol condensation between the lithium enolate of endo-2-methyl-bicyclo[2.2.1]-hept-5-enyl ethyl ketone 1 and a variety of alpha-methyl chiral aldehydes. 2-Aryl- and 2-vinyl-propionaldehyde gave rise to the predicted syn, syn "Felkin-Anh" diastereoisomers. In contrast beta-alkoxy or beta-silyloxy alpha-methyl aldehydes lead to the syn, anti aldols arising from an apparent chelation control.