S-Allyl N-acylmonothiocarbamates react in boiling benzene with primary
and secondary amines in the presence of catalytic amounts of triethyl
amine. In this reaction. the S-allyl group is replaced with the amino
group under formation of N-acylurea derivatives in 45 - 90% yields. Th
e wide applicability of the reaction is demonstrated by the synthesis
of eighty four N-acyl-N'-substituted and N-acyl-N',N'-disubstituted ur
eas with various aliphatic, aromatic and heterocyclic substituents.