series of asymmetric ureas were synthesized by a one-pot reaction of amines and carbonyl sulfide (COS) under catalyst-free conditions. The highly selective synthesis of asymmetric urea was successfully achieved by the use of weakly nucleophilic aromatic amines and highly nucleophilic secondary aliphatic amines. Moreover, a reaction mechanism was proposed based on the detailed NMR and FTIR study. This efficient
Chimishkyan, A. L.; Leonova, T. V.; Gulyaev, N. D., Journal of Organic Chemistry USSR (English Translation), 1984, vol. 20, # 11, p. 2197 - 2203
作者:Chimishkyan, A. L.、Leonova, T. V.、Gulyaev, N. D.、Kusakin, M. S.
DOI:——
日期:——
CHIMISHKYAN, A. L.;LEONOVA, T. V.;GULYAEV, N. D.;KUSAKIN, M. S., TR. MOSK. XIM.-TEXNOL. IN-TA,(1987) N 149, 14-22
作者:CHIMISHKYAN, A. L.、LEONOVA, T. V.、GULYAEV, N. D.、KUSAKIN, M. S.
DOI:——
日期:——
Chimishkyan, A. L.; Gulyaev, N. D.; Leonova, T. V., Journal of Organic Chemistry USSR (English Translation), 1989, vol. 25, # 1.1, p. 20 - 24
作者:Chimishkyan, A. L.、Gulyaev, N. D.、Leonova, T. V.
DOI:——
日期:——
Synthesis of ureas in the bio-alternative solvent Cyrene
作者:Liam Mistry、Kopano Mapesa、Thomas W. Bousfield、Jason E. Camp
DOI:10.1039/c7gc00908a
日期:——
Cyrene as a bio-alternative solvent: a highly efficient, waste minimizing protocol for the synthesis of ureas from isocyanates and secondary amines in the bio-available solvent Cyrene is reported. This method eliminated the use of toxic solvents, such as DMF, and established a simple work-up procedure for removal of the Cyrene, which led to a 28-fold increase in molar efficiency versus industrial standard