Journal
ORGANIC LETTERS
Volume 7, Issue 6, Pages 1181-1184Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol050195l
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[GRAPHICS] Proline-catalyzed aldol reactions of tetrahydro-4H-thipyranone with racemic 1,4-dioxa-8-thia-spiro[4.5]decane-6-carboxaldehyde and with meso/dl 1,4-dioxa-8-thiaspiro[4.5]decane-6,10-dicarboxaldehyde proceed with dynamic kinetic resolution and give single adducts in good yields with excellent ee's. The high enantiotopic group selectivity results from the high intrinsic diastereoface selectivity of the aldehydes. These reactions significantly extend the scope of the enantioselective direct aldol reaction and constitute simple and efficient syntheses of useful tetrapropionate synthons.
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