Pd-Catalyzed Carboetherification of β,γ-Unsaturated Oximes: A Novel Approach to Δ2-Isoxazolines
摘要:
A novel route to the synthesis of Delta(2)-isoxazoline derivatives is described. Reaction of beta,gamma-unsaturated oximes with aryl bromides via palladium-catalyzed carboetherification affords 3,5-disubstituted Delta(2)-isoxazolines in good yields. The use of Xantphos as ligand is crucial for the transformation. The carboetherification products can be further converted to beta-hydroxy ketones in the presence of Fe powder and NH(4)Cl.
Pd-Catalyzed Carboetherification of β,γ-Unsaturated Oximes: A Novel Approach to Δ2-Isoxazolines
摘要:
A novel route to the synthesis of Delta(2)-isoxazoline derivatives is described. Reaction of beta,gamma-unsaturated oximes with aryl bromides via palladium-catalyzed carboetherification affords 3,5-disubstituted Delta(2)-isoxazolines in good yields. The use of Xantphos as ligand is crucial for the transformation. The carboetherification products can be further converted to beta-hydroxy ketones in the presence of Fe powder and NH(4)Cl.
Photoredox/Nickel Dual-Catalyzed Allylation of Aldehydes with Allylic Alcohols and Mechanistic Insights in the Presence of CO2
作者:Zeyu Zhang、Zongchang Han、Jiayuan Li、Han-Shi Hu、Jun Li、Chanjuan Xi
DOI:10.1021/acscatal.4c03991
日期:2024.8.16
Direct utilization of allylic alcohols as allylic reagents without metal reductants has drawn significant attention. Herein, we report a practical, diastereoselective photoredox/Ni(II)-dual-catalyzed reductive allylation reaction of aldehydes with readily accessible allylic alcohols in the presence of CO2. This methodology allows the branched regioselective direct allylation of a wide range of aldehydes