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Reagents and conditions: (a) K2CO3, DMF, 50 °C, 12 h, 59%–62%; (b) 20% TFA/DCM, rt; (c) o-phenylenediamine, HATU, DIEA, DMF, rt, 12 h, 68%–73%; (d) O-tritylhydroxylamine, HATU, DIEA, DMF, rt, 12 h, 72%–77%; (e) TES, 20% TFA/DCM, rt, 30 min, 67%–71%.
