화학공학소재연구정보센터
Journal of the American Chemical Society, Vol.141, No.38, 15024-15028, 2019
Enantioselective Alkylation of 2-Alkylpyridines Controlled by Organolithium Aggregation
Direct enantioselective alpha-alkylation of 2-alkylpyridines provides access to chiral pyridines via an operationally simple protocol that obviates the need for prefunctionalization or preactivation of the substrate. The alkylation is accomplished using chiral lithium amides as noncovalent stereodirecting auxiliaries. Crystallographic and solution NMR studies provide insight into the structure of well-defined chiral aggregates in which a lithium amide reagent directs asymmetric alkylation.