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note
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4) and evaporated. Flash chromatography of the residue furnished hydroxy ketone 1c (0.124 g, 79%) with 77% ee as determined by chiral-phase HPLC analysis. Next, to a stirred mixture of hydroxy ketone 1c (38 mg, 0.182 mmol) and 4 Å molecular sieves in vinyl acetate (1 mL) was added PS-C Amano I (45 mg). The flask was evacuated and filled with argon three times before it was closed and the reaction left to stir at rt for 12 h to furnish acetate 2c in 76% yield with ee >99% as determined by chiral-phase HPLC analysis. No trace of the elimination product was detected by NMR or HPLC analyses
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The direct addition of vinyl acetate to the reaction mixture containing acetone significantly decreased the lipase-catalyzed kinetic resolution step
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4544269160
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note
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4) and evaporated and the residue purified by silica-gel column chromatography to provide hydroxy ketone ent-1c in 51% yield (0.11 g) with >99% ee
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