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DOI: 10.1055/s-2008-1032166
An Efficient and Eco-friendly Process for the Conversion of Carbon Dioxide into Oxazolones and Oxazolidinones under Supercritical Conditions
Publication History
Publication Date:
08 February 2008 (online)
Abstract
The cycloaddition reactions of carbon dioxide with propargylic alcohols and amines under supercritical conditions produce 4-methyleneoxazolidin-2-ones or 4-methyloxazol-2-ones. The optimized conditions consist of the use of an alcohol (2 mmol), an amine (2 mmol), copper(I) iodide (0.1 mmol), carbon dioxide (8 MPa), and a temperature of 60 °C. The regiochemical control is dependent on the substituents of the propargylic alcohols. Tertiary propargylic alcohols give 4-methyleneoxazolidin-2-ones, while primary and secondary ones generate 4-methyloxazol-2-ones. The effects of various parameters such as temperature, pressure, and time have also been investigated.
Key words
propargylic alcohols - cycloadditions - heterocycles - oxazolones and oxazolidinones - supercritical carbon dioxide
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