For the metal-catalyzed asymmetric hydrogenation of α-substituted ketones, cis reductive products are generally obtained due to steric hindrance of substituents. Herein, an unprecedented trans reductive products were observed in palladium-catalyzed hydrogenative desymmetrization of cyclic and acyclic 1,3-diketones, providing the chiral trans β-hydroxy ketones with two adjacent stereocenters including one α-tertiary or quaternary stereocenter with high enantioselectivity and diastereoselectivity. Mechanistic studies and DFT calculations suggested that the rarely observed diastereoselectivity reversal is ascribed to the charge-charge interaction between the palladium and aromatic ring of the substrate, which could not only result in the reversal of the diastereoselectivity, but also improve the reactivity.

中文翻译：

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钯-芳烃相互作用中非对映选择性的逆转导致1,3-二酮的氢化脱对称

对于α-取代的酮的金属催化的不对称氢化，由于取代基的空间位阻，通常获得顺式还原产物。在本文中，在钯催化的环状和非环状1,3-二酮加氢脱对称反应中观察到了前所未有的反式还原产物，从而提供了手性反式具有两个相邻立体中心的β-羟基酮，其中一个α-叔或四级立体中心具有高对映选择性和非对映选择性。机理研究和DFT计算表明，很少见到的非对映选择性逆转归因于钯与底物芳环之间的电荷-电荷相互作用，这不仅可以导致非对映选择性逆转，而且可以提高反应活性。