+++ 2 статьи Tetrahedron Letters и J. Org. Chem Спасибо!

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Tetrahedron Letters
Volume 34, Issue 21, 21 May 1993, Pages 3389-3392
Urethane protected derivatives of 1-guanylpyrazole for the mild and efficient preparation of guanidines
Michael S. Bernatowicz*, a, Youling Wua and Gary R. Matsuedaa

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http://dx.doi.org/10.1016/S0040-4039(00)79163-5

J. Org. Chem., 1992, 57 (8), pp 2497–2502
1H-Pyrazole-1-carboxamidine hydrochloride an attractive reagent for guanylation of amines and its application to peptide synthesis
Michael S. Bernatowicz, Youling Wu, Gary R. Matsueda

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http://dx.doi.org/10.1021/jo00034a059

Спасибо!

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