Enantioselective Synthesis of Chiral α-Aryl or α-Alkyl Substituted Ethylphosphonates via Rh-Catalyzed Asymmetric Hydrogenation with a P-Stereogenic BoPhoz-Type Ligand
摘要:
An enantioselective synthesis of optically active 1-aryl or 1-alkyl substituted ethylphosphonates, based on the first Rh-catalyzed asymmetric hydrogenation of corresponding alpha,beta-unsaturated precursors with a P-stereogenic BoPhoz-type ligand under the mild condition, was developed, in which a wide range of 1-aryl or 1-alkyl substituted ethylphosphonates were achieved in up to 98% ee.
A Simple and Efficient Method for One-Pot, Three-Component Synthesis of Terminal Vinylphosphonates Using a Task-Specific Ionic Liquid
作者:Sara Sobhani、Moones Honarmand
DOI:10.1055/s-0032-1317965
日期:——
convenient and practical method for the one-pot, three-componentsynthesis of terminal vinylphosphonates from readily available starting materials (aryl/alkyl/heteroaryl aldehydes, nitromethane and trialkylphosphites) through a tandem Henry–Michael reaction followed by nitro elimination in the presence of 5-hydroxypentylammonium acetate (5-HPAA) as a task-specific ionicliquid, is described. This method offers
A Palladium-Catalyzed Decarboxylative Heck-Type Reaction of Disubstituted Vinylphosphonates in the Stereoselective Synthesis of Trisubstituted Vinylphosphonates
作者:Linjing Ren、Maogang Ran、Jiaxin He、Dan Xiang、Feng Chen、Peijun Liu、Chunyang He、Qiuli Yao
DOI:10.1002/ejoc.201900810
日期:2019.9.8
We describe a highly stereoselective and atomically economical approach for the preparation of trisubstituted vinylphosphonates through palladium‐catalyzed decarboxylative Heck‐type reactions of vinylphosphonates. Excellent E/Z selectivity was achieved mostly with E‐isomers with oxygen in the air was the sole oxidant; this was difficult to achieve via traditional methods. This work is the first example
It has been demonstrated for the first time that alpha-phosphonovinyl tosylates could efficiently couple with a range of arylboronic acids to access alpha-arylethenylphosphonates. The unprecedented procedure exhibits excellent functional group tolerance, giving the terminal vinylphosphonates in good to excellent isolated yields (60-99%) under mild reaction conditions.
α-Phosphonovinyl Arylsulfonates: An Attractive Partner for the Synthesis of α-Substituted Vinylphosphonates through Palladium-Catalyzed Suzuki Reactions
A new and attractive coupling partner for the synthesis of α‐substituted vinylphosphonates through Suzuki reactions has been developed. The developed O‐centered electrophiles couple with various organoboron reagents to give α‐substituted vinylphosphonates in moderate to excellent yields. This protocol features broad substrate scope, mild conditions, and high efficiency.
Enantioselective Synthesis of Chiral α-Aryl or α-Alkyl Substituted Ethylphosphonates via Rh-Catalyzed Asymmetric Hydrogenation with a <i>P</i>-Stereogenic BoPhoz-Type Ligand
An enantioselective synthesis of optically active 1-aryl or 1-alkyl substituted ethylphosphonates, based on the first Rh-catalyzed asymmetric hydrogenation of corresponding alpha,beta-unsaturated precursors with a P-stereogenic BoPhoz-type ligand under the mild condition, was developed, in which a wide range of 1-aryl or 1-alkyl substituted ethylphosphonates were achieved in up to 98% ee.