Methylcarbonate and Bicarbonate Phosphonium Salts as Catalysts for the Nitroaldol (Henry) Reaction

作者: Massimo Fabris , Marco Noè , Alvise Perosa , Maurizio Selva , Roberto Ballini

DOI: 10.1021/JO202294K

关键词: Ionic liquidPhosphoniumBicarbonateChemistryNucleophileSteric effectsOrganic chemistryCatalysisNitroaldol reaction

摘要: Phosphonium ionic liquids exchanged with bicarbonate and methylcarbonate anions (CILs) exhibit catalytic performances comparable to those of sterically hindered (non nucleophilic) organosuperbases such as DBU. At 25–50 °C, under solventless conditions, CILs efficiently catalyze the Henry addition different aldehydes ketones nitroalkanes: not only they allow selective formation nitroaldols but unlock a novel high-yielding access dinitromethyl derivatives ketones.

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