Journal of Organic Chemistry p. 4456 - 4458 (1991)
Update date:2022-08-04
Topics:
Fournier, Jean
Bruneau, Christian
Dixneuf, Pierre H.
Lecolier, Serge
Aliphatic and araliphatic primary amines react with carbon dioxide at 120-140 deg C in the presence of ruthenium complexes and terminal alkynes, especilly propargyl alcohols, to directly afford N,N'-disubstituted symmetrical ureas.The alkyne ruthenium intermediate acts as a dehydrating reagent.This new and mild method avoids the classical use of carbonyl precursors like phosgene or isocyanates.
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