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Synthesis 2007(12): 1848-1860
DOI: 10.1055/s-2007-983706
DOI: 10.1055/s-2007-983706
PAPER
© Georg Thieme Verlag Stuttgart · New York
Synthetic Routes to N-Pmc-N′,N′′-Disubstituted Guanidines via EDCI-Mediated Guanylation of Amines with N-Pmc-N′-Substituted Thioureas
Further Information
Received
2 November 2006
Publication Date:
08 June 2007 (online)
Publication History
Publication Date:
08 June 2007 (online)
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Abstract
An overview of the facile and high-yielding EDCI-mediated reaction of amines with N-Pmc-N′-alkyl thioureas to afford guanidines is presented, in which the general scope and limitations of the reaction are probed. It was found that the N-sulfonyl-N′-substituted thioureas cannot possess internal nucleophiles or disubstitution, and that the incoming amine must possess adequate nucleophilicity in order for the reaction to be viable. However, it is noted that the guanidine products can be accessed through two possible synthetic approaches, and that a simple reversal of amine and thiourea substituents allows the reaction to proceed successfully.
Key words
guanidine - guanylation - thiourea - EDCI - N-sulfonyl
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