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Synthesis 1986; 1986(3): 226-228
DOI: 10.1055/s-1986-31626
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Synthesis of Hexasubstituted Carbamimidic Acid Anhydrides and of N 1,N 1,N 2-Trisubstituted Formamidines from 1,1,3-Trisubstituted Ureas

Motoki Torizuka* , Yasuo Kikugawa, Hiromu Nagashima
  • *Faculty of Pharmaceutical Sciences, Josai University, 1-1 Keyakidai, Sakado, Saitama 350-02, Japan
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Publikationsdatum:
20. August 2002 (online)

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1,1,3-Trisubstituted ureas 1 were converted with phosphoryl chloride to hexasubstituted carbamimidic acid anhydrides 2 which were hitherto unknown or difficult to prepare by other methods. The ureas bearing bulky substituents were converted to amidinoyl chlorides 3 which were reduced to the corresponding formamidines 5 with amine-boranes in acid.