1.1R:AcOH, R:PDC, S:CH2Cl2, rt
2.1R:NaBH4, S:MeOH, 1 h, rt
2.2S:H2O, rt
2.3R:NaH, S:DMF, 30 min, rt
2.4R:AcOH, S:H2O, rt
3.1R:DOWEX 50W, S:H2O, S:Dioxane, 22 h, 80°C; 80°C → rt
3.2R:Bu2SnO, S:MeOH, 2 h, reflux; reflux → rt
3.3R:K2CO3, S:DMF, 27 h, rt
4.1S:C5H5N, 6 h, rt
4.2S:H2O, cooled
5.1R:C5H5N, R:AcOH, R:H2, C:Pd, S:H2O, S:MeOH, 1 d, rt, 50 psi
6.1R:POCl3, S:THF, 0°C; 2 h, 0°C
6.2S:H2O, 1 h, 0°C
7.1R:H2, C:Pd, S:EtOH, 2 d, rt, 50 psi
8.1R:R:Bu3N, S:DMF, 3 h, rt; rt → 0°C
8.2S:Me2CHOH, 30 min, 0°C
8.3R:C5H5N, S:DMF, 1 d, rt
8.4R:NH4OAc, S:H2O, rt, pH 4.8

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