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.
The first palladium‐catalyzed method for the arylation of α‐phosphonovinyl nonaflates is described. Using a catalyst comprised of Pd(OAc)2 and SPhos, terminal and internal α‐aryl vinylphosphonates could be efficiently accessed under mild conditions. The reaction features a broad coupling partner scope and tolerates many functional groups.
Lewis Acid Enables Ketone Phosphorylation: Synthesis of Alkenyl Phosphonates
作者:Xiao‐Hong Wei、Chun‐Yuan Bai、Lian‐Biao Zhao、Ping Zhang、Zhen‐Hua Li、Yan‐Bin Wang、Qiong Su
DOI:10.1002/cjoc.202100083
日期:2021.7
efficient Lewis acid enabled ketones phosphonylation to synthesize vinylphosphonates has been developed. This method relays on ketone hydrophosphonylation/α-hydroxy phosphonates unimolecular elimination (E1) dehydration cascade reaction sequence. Various C—P bond formation products were obtained in moderate to excellent yields with water as the only byproduct in the reaction.
A simple and straightforward method for the synthesis of α-substituted ethylphosphonates via diimide reduction strategy is described. With K3PO4 or Na2CO3 as the basic additive, a range of terminal alkenylphosphonates underwent efficient reduction by diimide generated from 2-nitrobenzenesulfonylhydrazide (NBSH) under room temperature. The high functional group tolerance of this methodology is also
描述了一种通过二酰亚胺还原策略合成α-取代的乙基膦酸酯的简单直接的方法。以K 3 PO 4或Na 2 CO 3为基本添加剂,在室温下,一定范围内的末端链烯基膦酸酯被2-硝基苯磺酰肼(NBSH)生成的二酰亚胺有效还原。还证明了该方法具有较高的官能团耐受性。此外,我们的方法具有安全性高,反应条件温和,对设备的要求低以及化学选择性高的特点。
A practical synthetic approach to chiral α-aryl substituted ethylphosphonates
作者:Natalia S Goulioukina、Tat'yana M Dolgina、Irina P Beletskaya、Jean-Christophe Henry、Damien Lavergne、Virginie Ratovelomanana-Vidal、Jean-Pierre Genet
DOI:10.1016/s0957-4166(01)00031-3
日期:2001.2
A convenientgeneral method is reported for the synthesis of α-aryl substituted ethylphosphonic acids and esters by hydrogenation of α-aryl substituted ethenylphosphonic acids and esters. Racemic α-arylethylphosphonic acids and esters were prepared in 70–88% yield under palladium-assisted transferhydrogenation conditions using ammonium formate. Asymmetric hydrogenation of α-arylethenylphosphonic acids