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Reagents and conditions: (a) (1) aldehyde scaffolds, piperidine, AcOH, toluene, reflux, (2) Cu(acac)2, LiOH·H2O, N1,N2-bis(4-hydroxy-2,6-dimethylphenyl)oxalamide, DMSO/H2O, 80 °C, (3) fluorine scaffolds, NaH or Cs2CO3, DMF, 95 °C.
