A highly efficient asymmetric hydrogenation of a series of γ-keto acid derivatives, including γ-keto acids, esters, and amides, using a Ni-(R,R)-QuinoxP* complex as the catalyst has been developed to afford chiral γ-hydroxy acid derivatives with excellent enantioselectivities, up to 99.9% ee. This method provides not only an economical one-pot approach for the synthesis of chiral γ-lactones but also
使用 Ni-( R , R )-QuinoxP* 配合物作为催化剂,开发了一系列 γ-酮酸衍生物(包括 γ-酮酸、酯和酰胺)的高效不对称氢化,以提供手性 γ-具有优异对映选择性的羟基酸衍生物,高达 99.9% ee。该方法不仅为合成手性 γ-内酯提供了一种经济的一锅法,而且还提供了 ( S )-去甲氟西汀(一种神经血清素再摄取抑制剂和药物合成的重要中间体)。
Ni-Catalyzed Asymmetric Hydrogenation of Aromatic Ketoacids for the Synthesis of Chiral Lactones
作者:Chen-Qiang Deng、Jin Deng
DOI:10.1021/acs.orglett.2c00608
日期:2022.4.8
asymmetric hydrogenation of aromatic γ- and δ-ketoacids has been developed, affording a series of γ- and δ-aryl lactones in high yields and excellent enantioselectivities (≤98% ee). The hydrogenation could occur smoothly on a gram scale with 0.05 mol % catalyst loading (S/C = 2000). This protocol provides an efficient and practical approach for accessing chiral lactones with important potential applications
Copper‐Catalyzed Radical Enantioselective Carbo‐Esterification of Styrenes Enabled by a Perfluoroalkylated‐PyBox Ligand
作者:Zaicheng Nie、Mong‐Feng Chiou、Jinfeng Cui、Yanjie Qu、Xiaotao Zhu、Wujun Jian、Haigen Xiong、Yajun Li、Hongli Bao
DOI:10.1002/anie.202202077
日期:2022.7.11
The radicalenantioselective carbo-esterification of styrenesenabled by a newly developed perfluoroalkylated-PyBox ligand and copper catalysis is reported. Mechanistic studies reveal that this reaction is a rare example of an efficient ligand-decelerated system, in which the ligand decelerates the reaction, but the reaction is still efficient with reduced amounts of ligand.