作者:Stamatis Fotaras、Christoforos G. Kokotos、Evaggelia Tsandi、George Kokotos
DOI:10.1002/ejoc.201001417
日期:2011.3
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 and with high
合成了基于α-氨基酸酰胺(脯氨酸、缬氨酸和苏氨酸)和带有硫脲基团的手性二胺的有机催化剂,并研究了它们对羟醛反应的活性。基于 (S)-脯氨酸和 (1S,2S)-二苯基乙二胺的催化剂被证明是一种极好的催化剂,以高到定量的收率和高立体选择性(高达 98:2 dr和 99% ee)。酸添加剂(4-硝基苯甲酸)的存在对产率和对映选择性都有相当大的影响。