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Reagents and conditions: a) NaN3, DMF, 70 °C (62%); b) LiBr, DMF, 70 °C (82%); c) NaH, DMF (91%); d) H2, Pd/C 10% w/w, MeOH (74% for 6, 99% for 10); e) TBTU/HOBt/Et3N, THF/DMF (78%), f) HATU/DIPEA, DMF (92% for 8; 77% for 9); g) TFA, CH2CI2, rt (92%). h) 3 M HCl, dioxane (94%)
