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It′s a cinch! The title reaction with azomethine imines 1 uses an operationally simple procedure, based on the combination of the bromide salt of cinchona alkaloids (3) and KOH. The procedure is reliable and general. Trifluoromethyl-substituted amines can be accessed by a two-step deprotection of the product (S)-2.
Kawai et al. (Fri,) studied this question.