Scheme 2.
Reagents and conditions: (i) K2CO3, DMF, 80 °C; (ii) (a) Pd–C/H2, EtOH, rt, (b) 5 or 10, EtOH, rt; (iii) dibenzoyl-L-tartaric acid, EtOH; (iv) (a) Pd–C/H2, EtOH, rt, (b) 5, EtOH, rt.
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