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Beilstein J. Org. Chem. 2013, 9, 1737–1744, doi:10.3762/bjoc.9.200
Graphical Abstract
Scheme 1: Schematic nitro-Mannich reaction.
Scheme 2: Retrosynthetic analysis of piperazirum.
Scheme 3: (a) iBuMgCl, Et2O, −78 °C; (b) KOH, EtOH/H2O, 100 °C; (c) (COCl)2.
Scheme 4: (a) Li(Et3BH), THF, rt then 14, CF3CO2H, −78 °C, dr 70:30; (b) (CF3CO)2O, Py, CH2Cl2, 0 °C to rt; (...
Scheme 5: (a) Li(Et3BH), CH2Cl2, rt then 19, CF3CO2H, −78 °C, dr >95:5; (b) Zn, 6 M HCl, EtOAc/EtOH, rt, sing...
Scheme 6: (a) (COCl)2, DMF, CH2Cl2, rt; (b) 21, Py, DMAP, CH2Cl2, rt; (c) EDC, HOBt, THF/CH2Cl2, rt; (d) H2 (...
Figure 1: X-ray crystal structure of 2·HCl.