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1-Imidoalkylphosphonium salts with modulated C?-P+ bond strength: synthesis and application as new active ?-imidoalkylating agents.


ABSTRACT: An effective synthesis of the hitherto unknown 1-imidoalkylphosphonium salts has been developed in the reported study. The crucial step in the method included the decarboxylative ?-methoxylation of N-phthaloyl- or N-succinylamino acids to the corresponding N-(1-methoxyalkyl)imides, followed by the displacement of the methoxy group by the triarylphosphonium group through melting of the imide derivative with triarylphosphonium tetrafluoroborate. The imidoalkylating properties of the obtained 1-imidoalkylphosphonium salts were tested using the Tscherniac-Einhorn-type reaction with aromatic hydrocarbons as a model reaction. It was found that the C?-P+ bond strength can be considerably reduced and the imidoalkylation of arenes can be markedly facilitated using 1-imidoalkylphosphonium salts derived from triarylphosphines with electron-withdrawing substituents such as tris(m-chorophenyl)phosphine, tris(p-chlorophenyl)phosphine and tris[p-(trifluoromethyl)phenyl]phosphine. Microwave irradiation also considerably facilitates the cleavage of the highly polar C?-P+ bond.

SUBMITTER: Adamek J 

PROVIDER: S-EPMC5550811 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature

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1-Imidoalkylphosphonium salts with modulated C<sub>α</sub>-P<sup>+</sup> bond strength: synthesis and application as new active α-imidoalkylating agents.

Adamek Jakub J   Mazurkiewicz Roman R   Węgrzyk Anna A   Erfurt Karol K  

Beilstein journal of organic chemistry 20170724


An effective synthesis of the hitherto unknown 1-imidoalkylphosphonium salts has been developed in the reported study. The crucial step in the method included the decarboxylative α-methoxylation of <i>N</i>-phthaloyl- or <i>N</i>-succinylamino acids to the corresponding <i>N</i>-(1-methoxyalkyl)imides, followed by the displacement of the methoxy group by the triarylphosphonium group through melting of the imide derivative with triarylphosphonium tetrafluoroborate. The imidoalkylating properties  ...[more]

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