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“Introduction 5-FU in vivo The carbon–carbon triple bond is one of the most important functional groups in organic chemistry and pharmacology. The structure activity relationship studies suggest that introduction of alkyne motif may significantly modify the chemical, physical, and biological properties of acetylenic compounds (Ben-Zvi and Danon, 1994). Among a large group of synthetic and natural acetylenic compounds the quinolines possessing an alkynyl moieties are of particular interest as many of them display important activities, namely antimicrobiological, anticancer, antiprotozoal, and antiretroviral (Fuita et al., 1998; Fakhfakh et al., 2003; Abele et al., 2002).