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2005
Carbohydrates
U 0500
Direct Amino Acid Catalyzed Asymmetric Synthesis of Polyketide Sugars. —
synthesis of hexoses in the presence of L- and D-proline proceeds with excellent
26- 124 The
chemo-, diastereo- and enantioselectivity. Best results are achieved in a two-step procedure where the intermediate β-hydroxy aldehyde [cf. (III)] is isolated and purified
(no yields given). Treatment of the products with MnO2 opens a novel route to enantiomerically pure δ-lactones from aldehydes. — (CASAS, J.; ENGQVIST, M.;
IBRAHEM, I.; KAYNAK, B.; CORDOVA*, A.; Angew. Chem., Int. Ed. 44 (2005) 9,
1343-1345; Dep. Org. Chem., Arrhenius Lab., Univ. Stockholm, S-106 91 Stockholm,
Swed.; Eng.) — S. Adam
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