Reduction of phosphineoxides into the corresponding phosphines using PhSiH3 as a reducing agent and Ph3C+[B(C6F5)4]− as an initiator is described. The process is highly efficient, reducing a broad range of secondary and tertiary alkyl and arylphosphines, bearing various functional groups in generally good yields. The reaction is believed to proceed through the generation of a silyl cation, which reaction
描述了使用PhSiH 3作为还原剂和Ph 3 C + [B(C 6 F 5 ) 4 ] -作为引发剂将氧化膦还原成相应的膦。该方法效率很高,可以减少各种带有各种官能团的仲和叔烷基和芳基膦,收率通常很高。据信,该反应通过生成甲硅烷基阳离子进行,该阳离子与氧化膦反应提供鏻盐,进一步被硅烷还原以提供所需的膦和硅氧烷。
B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-catalyzed O–H insertion reactions of diazoalkanes with phosphinic acids
A highly efficient base-, metal-, and oxidant-free catalytic O–H insertion reaction of diazoalkanes and phosphinic acids in the presence of B(C6F5)3 has been developed. This powerful methodology provides a green approach towards the synthesis of a broad spectrum of α-phosphoryloxy carbonyl compounds with good to excellent yields (up to 99% yield). The protocol features the advantages of operational
Desymmetrization of Phosphinic Acids via Pd-Catalyzed Asymmetric Allylic Alkylation: Rapid Access to <i>P</i>-Chiral Phosphinates
作者:Barry M. Trost、Simon M. Spohr、Alessa B. Rolka、Christopher A. Kalnmals
DOI:10.1021/jacs.9b07340
日期:2019.9.11
The synthesis of P-chiral compounds is a challenging task, especially since useful catalytic methods for preparing such molecules are scarce. Herein we disclose a desymmetrization that employs phosphinic acids as dynamic prochiral nucleophiles in a Pd-catalyzed asymmetricallylicalkylation reaction, furnishing phosphinates in high-ly enantio- and diastereoselective fashion. This new method has a wide
The present invention relates primarily to a process for producing particular phosphinates (phosphonous acid monoesters) and use thereof for producing biologically active substances which may be used in the pharmaceutical or agrochemical sector, preferably for producing phosphorus-containing amino acids.