Fast, robust, selective: Copper-catalyzed enantioselective additions of homopropargyl groups to a wide range of aldimines proceed readily and with high enantioselectivity. The catalytic method is scalable and practical, the allenylboron reagent is commercially available, and conversion into amines is inexpensive and high-yielding.
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Vieira et al. (2012) studied this question.
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