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The enantioselective synthesis of drugs is of fundamental importance in the pharmaceutical industry. In this experiment, students synthesize either enantiomer of warfarin, a widely used anticoagulant, in a single step from inexpensive starting materials. Stereoselectivity is induced by a commercial organocatalyst, (R,R)- or (S,S)-1,2-diphenylethylenediamine. The environmentally friendly microscale reaction is performed at ambient temperature, and the product can be purified by recrystallization or column chromatography. Product characterization includes thin-layer chromatography, NMR spectroscopy, and polarimetry.
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Wong et al. (2010) studied this question.
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