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.