An asymmetrichydrogenation of aroylacrylic acidscatalyzed by RuPHOX-Ru catalyst has been developed, affording the corresponding chiral γ-lactones in high yields and with up to 93% ee. The methodology has the advantage of utilizing easily accessible substrates and has therefore expand the scope of the resulting chiral γ-lactones. Furthermore, high catalytic efficiency was achieved in that the reduction
Enantioselective Ketone Hydroacylation Using Noyori’s Transfer Hydrogenation Catalyst
作者:Stephen K. Murphy、Vy M. Dong
DOI:10.1021/ja4021974
日期:2013.4.17
An enantioselectiveketone hydroacylation enables the direct preparation of lactones from keto alcohols. The alcohol is oxidized in situ to an aldehyde, obviating the need to prepare sensitive keto aldehyde substrates. Noyori's asymmetric transferhydrogenationcatalyst was applied to address challenges of reactivity, chemoselectivity, and enantioselectivity.
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)。
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.
A RuPHOX−Ru catalyzedasymmetrichydrogenation of γ‐keto acids has been developed, affording the corresponding enantiopure γ‐lactones in high yields and with up to 97% ee. The reaction could be performed on a gram scale with a relatively low catalyst loading (up to 10000 S/C) under the indicated reaction conditions and the resulting products can be transformed to several enantiopure building blocks
已开发出RuPHOX-Ru催化的γ-酮酸不对称氢化反应,可提供高收率和高达97%ee的相应对映体纯γ-内酯。该反应可以在指定的反应条件下以相对较低的催化剂负载量(最高10000 S / C)以克为单位进行,所得产物可以转化为几种对映纯结构单元,生物活性化合物和对映纯药物。