Answers are grounded in this paper and cite their sources.
A little goes a long way: A 1 mol % loading of the chiral phosphoric acid catalyst 2 converts aromatic and aliphatic imines such as 1 into the corresponding amines (4) in high yields and enantioselectivities if treated with Hantzsch dihydropyridine 3.
No takes yet. Share an insight, caveat, or question.
Hoffmann et al. (2005) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: