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85039349042
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note
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4, the solvent was evaporated and the crude product was purified by flash chromatography eluting with hexane/ethyl acetate (98/2). Enantiomeric excess was determined by chiral HPLC (Chiralcel OD column. 0.5 mL min-1, hexane:2-propanol 99:1, 254 nm). The optical rotation of the product was compared with literature data to assign the absolute configuration (R).
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