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Reagents and conditions: (m) HATU, DIEA, DMF, rt, 35%; (n) K2CO3, iPrOH, 100 °C, 51%; (o) 5-methyl-1H-tetrazole, dibenzyl diisopropylphosphoramidite, DCM, 0 °C – rt; (p) 35% H2O2 in water, DCM, 0 °C, 89% for two steps o & p; (q) H2, Pd–C, MeOH/EtOAc, rt, 78%.
