The synthesis and purification of 7-amino-4-(trifluoromethyl) courmarin, a novel fluorescent marker for the sensitive detection of proteinases, were investigated. Two byproducts, 7- hydroxy-4-(trifluoromethyl-2-quinolone and 2-ethoxy-7-hydroxy-4-(trifluoromethyl) quinoline, were isolated and identified. 7-Methoxy-4-(trifluoromethyl)-Zquinolone was also prepared. Amino acid and peptide derivatives prepared by solution methods using the stepwise ...