Scheme 2.
Reagents and conditions: (a) 4-NO2-Ph-NCO, toluene, 80°C; (b) H2 (40 psi), Pd/C, EtOH; (c) aldehyde, Na(OAc)3BH, 1,2-DCE; (d) acid, BOP, Et3N, THF.
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