Saumitra Sengupta. Stereoselective reduction of N-phthaloyl α-amino ketones: an expeditious new synthesis of non-racemic threo-α-amino epoxides // Tetrahedron: Asymmetry Volume 10, Issue 9, 7 May 1999, Pages 1653-1659
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http://dx.doi.org/10.1016/S0957-4166(99)00177-9