syn -Selective catalytic asymmetric nitro-Mannich reactions using a heterobimetallic Cu/Sm/Schiff base complex are described. The present method is complementary to the previously reported methods, and products were obtained in high syn -selectivity (>20:1), yield (99−62%), and enantioselectivity (98−83% ee). Both Cu and Sm metals, aligned suitably in a dinucleating Schiff base ligand, were essential to realize high syn -selectivity.
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Handa et al. (2007) studied this question.
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