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Reagents and Conditions for the synthesis of 5. (a) H2SO4, dimethoxypropane, MeOH, reflux, 4h, 100%; (b). H2, Pd-C, MeOH, 12h, bicarbonate workup, 88% de.;(c). crystallization from EtOAc, 70%, 100% de.; (d). Boc2O (10 equiv.), DMAP (50 mol%), 8h, 98%.
