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Reagents and conditions: (a) 5 N NaOH, reflux, 9 h; 10 N HCl, pH=3–5; 2 N MeOH/HCl, reflux, 2 h; (b) R1Cl, TEA, CH2Cl2, r.t., 9 h; (c) Bromoacety bromide, substituted aniline, TEA, CH2Cl2, r.t., 2 h; (d) 2, CH3CN, K2CO3, r.t.,6–8 h; (e) LiAlH4, THF, r.t., 1 h.
