(1R,2R)-DPEN-derived triazolium salts for enantioselective oxodiene Diels–Alder reactions
作者:Zi-Qiang Rong、Min-Qiang Jia、Shu-Li You
DOI:10.1016/j.tet.2011.09.129
日期:2011.12
Enantioselective oxodiene Diels-Alder reactions catalyzed by (1R,2R)-DPEN-derived triazolium salts were realized successfully. With 0.5 mol % of (1R,2R)-DPEN-derived triazolium salt C and 150 mol % of Et3N, the reactions of various alpha-chloroaldehydes (alpha-bromoaldehyde) with substituted enones led to 3,4-dihydropyridinones and their derivatives in good yields, diastereoselectivities, and enantioselectivities (up to 97% ee). (C) 2011 Elsevier Ltd. All rights reserved.