Abstract
Umbelliferone-6-carbonyl chloride reacted with amines and α-, β-, and ω-amino acid methyl esters to afford the corresponding N-substituted 7-hydroxy-2-oxo-2H-chromene-6-carboxamides. The reaction of umbelliferone-6-carbonyl chloride with glycine gave 2-(7-hydroxy-2-oxo-2H-chromene-6-carboxamido)acetic acid which was converted into acid chloride, and the latter reacted with benzylamines and α-amino acid methyl esters to produce compounds containing a dipeptide fragment.
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