Reaction of Boranephosphonate Diesters with Pyridines or Tertiary Amines in the Presence of Iodine: Synthetic and Mechanistic Studies.
J Org Chem
; 85(6): 4312-4323, 2020 03 20.
Article
em En
| MEDLINE
| ID: mdl-32073846
ABSTRACT
Boranephosphonate diesters react with heteroaromatic and certain tertiary amines in the presence of an oxidant (I2) to afford the boron-modified phosphodiester analogues containing a P-B-N structural motif. Our multinuclear 31P and 11B NMR spectroscopy studies lend support for a two-step mechanism involving generation of a λ3-boranephosphonate intermediate that immediately coordinates an amine in the solvent cage, leading to B-pyridinium or B-ammonium boranephosphonate betaine derivatives. We found that the type of the solvent used (e.g., dichloromethane vs acetonitrile) significantly affected the course of the reaction, resulting in either formation of boron-modified derivatives or loss of the boron group with a subsequent oxidation of the phosphorus atom. In aprotic, electron-donating, polar solvents., e.g., acetonitrile (ACN) and tetrahydrofuran (THF), a λ3-boranephosphonate intermediate can also coordinate solvent molecules forming P-B-ACN or P-B-THF complexes that may influence the type of the products formed.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2020
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Article