Journal
ADVANCED SYNTHESIS & CATALYSIS
Volume 353, Issue 1, Pages 133-146Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.201000607
Keywords
carbon dioxide fixation; carboxylation; homogeneous catalysis; organocatalysis; supercritical fluids
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Funding
- Ministero dell'Universita e della Ricerca Scientifica e Tecnologica (Progetto d'Interesse Nazionale) [2008A7P7YJ-005]
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The reactions of propargyl alcohols with carbon dioxide in supercritical carbon dioxide or in acetonitrile with gaseous carbon dioxide in the presence of organic bases as catalysts have been examined. Bicyclic guanidines are effective catalysts for the formation of alpha-methylene cyclic carbonates under mild reaction conditions. Oxoalkyl carbonates, oxoalkyl carbamates or alpha-methyleneoxazolidinones are obtained in high yields and good selectivities in one-step starting from propargyl alcohols and an external nucleophile (alcohols or amines) using bicyclic guanidines as catalysts in supercritical carbon dioxide. Propargylic diols under the same reaction conditions underwent a rearrangement process instead of carbon dioxide insertion whereas in the presence of an external nucleophile the formation of oxocarbonates, oxocarbamates or cyclic carbamates was achieved in satisfactory yields.
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