Scheme 7. Synthesis of Secondary Amine.
Reaction conditions: (i) 1. 5, AcOH, THF/MeOH, 4 Å MS. 2. NaCNBH3; (ii) HCl, MeOH; (iii) AcOH, THF/MeOH, 4 Å MS. 2. NaCNBH3.
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