对映异构体是不对称催化中的一个重要概念,它能够获得依赖于作为试剂的相同手性来源的产品的两种对映异构体。当所需手性配体的只有一个对映异构体很容易获得但产品的两种对映异构体都是需要的时,这种策略作为一种替代方法特别有吸引力。尽管具有潜在的意义,但通过改变非手性反应参数来有效逆转对映选择性的一般催化方法仍然不发达。在这里,我们报告了我们的研究,重点是阐明路易斯酸催化的迈克尔加成中金属控制的对映选择性逆转的起源。严格的实验和计算研究表明,底物和配体之间的特定 Lewis 和 Brønsted 酸相互作用会根据金属催化剂的离子半径而变化,并且是导致观察到的对映体发散的关键因素。这具有进一步理解和促进未来对映发散转换设计的潜力。
Provide that a useful catalyst for homogeneous hydrogenation, particularly a catalyst for homogeneous asymmetric hydrogenation for hydrogenation, particularly asymmetric hydrogenation, which is obtainable with comparative ease and is excellent in economically and workability, and a process for producing a hydrogenated compound of an unsaturated compound, particularly an optically active compound using said catalyst with a high yield and optical purity.
Provide that a useful catalyst for homogeneous hydrogenation, particularly a catalyst for homogeneous asymmetric hydrogenation for hydrogenation, particularly asymmetric hydrogenation, which is obtainable with comparative ease and is excellent in economically and workability, and a process for producing a hydrogenated compound of an unsaturated compound, particularly an optically active compound using said catalyst with a high yield and optical purity.
Provide that a useful catalyst for homogeneous hydrogenation, particularly a catalyst for homogeneous asymmetric hydrogenation for hydrogenation, particularly asymmetric hydrogenation, which is obtainable with comparative ease and is excellent in economically and workability, and a process for producing a hydrogenated compound of an unsaturated compound, particularly an optically active compound using said catalyst with a high yield and optical purity.