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HRMS analysis determined the presence of oxazolidinone intermediates III i and II i, respectively, to be present in this reaction (see ref. [14]). Moreover, the addition of aldehyde product 4 b (99 % ee) to the racemic proline-catalyzed α-aminooxylation of ketone 3 a gave 4 a with 19 % ee. In comparison, the addition of aldehyde 2 a (99 % ee) enabled racemic proline to catalyze the α-aminooxylation of ketone 3 a to give 4 a with 66 % ee (see ref. [13]).
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