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Reagents and conditions: i, PhCHO, NaHSO3, AcNMe2, 150 °C, open flask; ii, CDI; iii, aq. NH3; iv, ArCOCl, pyridine; v, aq. NaOH (0.5 M), 60°C; vi, +NH4HCO2–, Pd/C, MeOH, DMF; vii, BBr3, CH2Cl2 reflux; viii, CbzCl, aq. K2CO3; ix, SOCl2; x, 5a, pyridine; xi, aq. K2CO3 (1.0 M), 100°C; xii, HBr, AcOH.
