Several novel chiral piperazinone and sulfamide-amine alcohols were synthesized starting from inexpensive and readily available L-proline and trans-4-hydroxy-L-proline. The catalytic activity of the sulfamide-amine alcohols for the asymmetric addition of diethylzinc to benzaldehyde were evaluated preliminarily.
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Fu et al. (2008) studied this question.
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