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1995 ketones ketones (benzene compounds) Q 0350 -104Enantioselective Synthesis of α-Branched α-Hydroxy Ketones via Chiral N-Sulfonyl-2-alkyl-2-cyano-1,3-oxazolidines.-Stereochemically pure 3-arenesulfonyl-1,3-oxazolidines (V) are used as key compounds for a novel enantioselective entry to α-hydroxy ketones (XI). This strategy enables asymmetric combining of an ortho ester (II) with cyanide in form of trimethylsilyl cyanide (IV) and two Grignard reagents (VI) and (VIII) with predictable absolute configuration. - (HARDER, T.; LOEHL, T.; BOLTE, M.; WAGNER, K.; HOPPE, D.; Tetrahedron Lett. 35 (1994) 40, 7365-7368; Org.-Chem. Inst., Univ. Muenster, D-48149 Muenster, Germany; EN)

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