Regio - and enantioselective bioreduction of ethyl 2,4-dioxoalkanoates and γ-Keto-α-enamino esters with fermenting baker's yeast
摘要:
2,4-Dioxoalkanoates 1a-d and the parent compounds gamma-keto-alpha-enamino esters 2a-d are regioselectively reduced by baker's yeast to (R)-alpha-hydroxy-gamma-ketoesters 4a-d in moderate to good chemical yield and appreciable enantioselectivity. Pig liver esterase enantioselective hydrolysis of the acetyl derivatives 3a-d, easily obtained by treatment of racemic alpha-hydroxy-gamma-keto esters 4a-d, produced the optically active (S) 4a-d in good chemical (60-92%) and optical (53-92%) yield.
Organocatalytic Enantioselective Synthesis of Secondary α-Hydroxycarboxylates
作者:Cong-Gui Zhao、Rajasekhar Dodda
DOI:10.1055/s-2007-982552
日期:2007.6
Enantioenriched secondary α-hydroxycarboxylates have been synthesized in good yields and enantioselectivities by using the cross-aldol reaction of ketones and ethyl glyoxylate with a proline-derived dipeptide as the catalyst.