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Khan, Imran A.; Saxena, Anil K. . (2013). Metal-Free, Mild, Nonepimerizing, Chemo- and Enantio- or Diastereoselective N-Alkylation of Amines by Alcohols via Oxidation/Imine–Iminium Formation/Reductive Amination: A Pragmatic Synthesis of Octahydropyrazinopyridoindoles and Higher Ring Analogues. The Journal of Organic Chemistry, 78(23), 11656–11669. doi:10.1021/jo4012249 
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