Enantioselective C–H Amination Catalyzed by Nickel Iminyl Complexes Supported by Anionic Bisoxazoline (BOX) Ligands
作者:Yuyang Dong、Colton J. Lund、Gerard J. Porter、Ryan M. Clarke、Shao-Liang Zheng、Thomas R. Cundari、Theodore A. Betley
DOI:10.1021/jacs.0c09839
日期:2021.1.20
Investigation of 6 via single-crystal X-ray crystallography, NMR and EPR spectroscopies, and computations revealed a Ni(II)-iminyl radical formulation, similar to its dipyrrinato congener. Complex 4 exhibits enantioselective intramolecular C-H bond amination to afford N-heterocyclic products from 4-aryl-2-methyl-2-azidopentanes. Catalytic C-H amination occurs under mild conditions (5 mol % catalyst, 60 °C)
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
Compounds and Compositions for Delivering Active Agents
申请人:Gomez-Orellana Maria Isabel
公开号:US20080255250A1
公开(公告)日:2008-10-16
Compounds and compositions for the delivery of active agents are provided. Methods of administration and preparation are provided as well.
提供用于传递活性成分的化合物和组合物。同时提供了管理和制备的方法。
ARYL KETONE COMPOUNDS AND COMPOSITIONS FOR DELIVERING ACTIVE AGENTS
申请人:Rath Parshuram
公开号:US20080167217A1
公开(公告)日:2008-07-10
The present invention provides aryl ketone compounds and compositions containing them which facilitate the delivery of active agents. The aryl ketone compounds have the formula
or a salt thereof, where n=1 to 9, and R
1
to R
5
are independently hydrogen, C
1
to C
4
alkyl, C
1
to C
4
alkoxy, C
2
to C
4
alkenyl, halogen, hydroxyl, —NH—C(O)—CH
3
, or —O—C
6
H
5
.