буду благодарен за след. статью:
Chemistry Letters
Vol. 37 (2008) , No. 5 p.506
Highly Efficient Method for the Synthesis of Carboxamides from Carboxylic Acids and Amines Using Pyridine-3-sulfonyl Chloride (3-PSC)
Setsuo Funasaka, Koji Kato and Teruaki Mukaiyama
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http://dx.doi.org/10.1246/cl.2008.506
