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Reagents and conditions: (a) Butanedione, MeOH, CH(OMe)3, (±)-10-camphorsulfonic acid, reflux; (b) Trifluoromethanesulphonic anhydride, pyridine, CH2Cl2, –78°C to rt; (c) 50:1 dimethylacetamide-water, 50°C; (d) NaOMe, MeOH, reflux; (e) 4:1 AcOH-water, reflux.
