1.1R:4-DMAP, S:CH2Cl2, 30 min, 0°C; 16 h, rt
1.2R:HCl, S:H2O
2.1S:MeOH, 16 h, 90°C
3.1R:Me3SiCl, S:CH2Cl2, rt; 4 d, rt
3.2R:H2O
4.1R:NaOH, S:H2O, S:EtOH, 16 h, reflux
4.2R:HCO2H, R:NH4Cl, S:H2O, pH 5
5.1R:Diimidazolyl ketone, S:THF, 1 h, rt
5.2S:H2O, S:THF, 2 h, rt
5.3R:HCO2H, acidify

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