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Reagents and conditions: (a) (i) Bn-NH2, K2CO3, DMF, 80 °C, 3–4 h, quantitative; (b) (i) Pt/C, H2 balloon, 20 °C, MeOH, 2–3 h; (ii) CH(OMe)3, HCOOH, 100 °C, 1–2 h (30–82%); (c) LDA, Cl3C–CCl3, THF, −78 °C, 4 h (37–91%); (d) piperazine, Et3N, t-BuOH, 120 °C, 18 h (25–80%).
