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Synthetic Communications
An International Journal for Rapid Communication of Synthetic Organic Chemistry
Volume 26, 1996 - Issue 2
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Original Articles

Synthesis of Symmetrical and Unsymmetrical Ureas Using Unsymmetrical Diaryl Carbonates

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Pages 331-349 | Received 11 May 1995, Published online: 21 Aug 2006

References

  • Sandler , S. R. and Karo , W. 1971 . Organic Functional Group Preparations , Vol. II , 135 – 165 . New York : Academic Press .
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  • Majer , P. and Randad , R. S. 1994 . J. Org. Chem. , 59 : 1937 – 1938 .
  • Hegarty , A. F. 1979 . Comprehensive Organic Chemistry , Edited by: Barton , D.H. R. and Ollis , W. D. Vol. 2 , 1084 Oxford : Pergamon Press . one possible explanation is that the second (tertiary) basic centre in (6) induces facile conversion to the isocyanates RNCO, the ease of this transformation reflecting the relative basicities of the amines (2)-(4)
  • Barcelo , G. , Senet , J.-P , Sennyey , G. , Bensoam , J. and Loffet , A. 1986 . Synthesis , : 627 – 632 .
  • Gresser , M. J. and Jenks , W. P. 1977 . J. Am. Chem. Soc. , 99 : 6963 – 6970 .
  • Brown , P. and Djerassi , C. 1967 . J. Am. Chem. Soc. , 89 : 2711 – 2719 .
  • Carbamates (10c, e) and (12) were not isolated and characterised.
  • Weygand , F. and Mitgau , R. 1955 . Chem. Ber. , 88 : 301 – 308 .

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