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Abstract
Several synthetic strategies to diamines 1– 3 are described. The optimum approach via opening of aziridine afforded 1– 3 in 29–60% yield over 3–5 steps. A study on formation of the benzylic stereocenter using Toste’s rhenium-catalyzed asymmetric reduction of phosphinyl ketimines was also evaluated and afforded 15 in 92% de.
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