Alkylation and Cyclization of Benzoylacetanilides<sup>1</sup>
作者:A. Langley Searles、Daniel Ressler
DOI:10.1021/ja01547a047
日期:1958.7
Dynamic Kinetic Resolution: Asymmetric Transfer Hydrogenation of α-Alkyl-Substituted β-Ketoamides
作者:John Limanto、Shane W. Krska、Benjamin T. Dorner、Enrique Vazquez、Naoki Yoshikawa、Lushi Tan
DOI:10.1021/ol902715d
日期:2010.2.5
Dynamic kinetic resolution (deracemization) of various alpha-alkyl-substituted beta-ketoamides 1 via asymmetric transfer hydrogenation proceeded efficiently to give the corresponding syn-beta-hydroxy amides 3 in high diastereo- and enantioselectivities. Specifically, subjection of 1 to HCO2H and Et3N in the presence of 0.5-1 mol % of pentafluorobenzenesulfonyl-DPEN-Ru catalyst 2b at 30-40 degrees C in either PhCH3 or CH2Cl2 generated the syn-hydroxy product 3 selectively in 15-33:1 dr, 93-97% ee, and 75-88% isolated yields.