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(a) Stereodivergent synthesis of (3S,4R)-and (3R,4S)-oxazolidinone 9 by switching the chirality of ligand cis-L2. (b) HPLC trace for 9 from (R,R)-(P,P)-cis-L2 and (R,R)-(M,M)-cis-L2. Enantiomeric excess was determined by HPLC using a Chiracel OD-H column. The absolute configuration of the product 9 was confirmed by comparing the sign of optical rotation with literature reported data34.
