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Organocatalysts based on α‐amino acid amides (proline,valine, and threonine) and chiral diamines bearing thiourea groups were synthesized and their activities for aldol reactions were studied. The catalyst based on (S)‐proline and (1S,2S)‐diphenylethylenediamine proved to be an excellent catalyst, providing the products of reactions between ketones and aromatic aldehydes in high to quantitative yields...
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