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Synthesis of DX-02-05. (a) BF3-Et2O, ClCH2CH2Cl, yield = 55%; (b) LiAlH4, CH3OH, yield = 86%; (c) MnO2, dry dichloromethane, yield = 91%; (d) hydroxylamine hydrochloride, DIPEA, CH3OH, yield = 66%; (e) NaBH3CN, 12 N HCl, CH3OH, yield = 43%.
