Direct and indirect reductive amination of aldehydes and ketones with solid acid-activated sodium borohydride under solvent-free conditions
Byung Tae Cho, Sang Kyu Kang
Tetrahedron, Volume 61, Issue 24, 13 June 2005, Pages 5725–5734
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http://dx.doi.org/10.1016/j.tet.2005.04.039