Synthesis and Characterization of Furo[3,2-h]Quinoliniums as Potent Non- Detergent Spermicides
Nirup B Mondal.
7-Aryl substituted furo[3,2-h]quinoliniums have been synthesised in two steps from 5-chloro-8-hydroxy-7-
iodo-quinoline through a tandem Sonogashira alkynylation-cyclization pathway using aryl acetylenes followed by quaternisation
reaction with alkyl halides under microwave irradiation. The compounds have been characterized spectroscopically
and assessed for their sperm-immobilizing efficacy in vitro by modified Sander–Cramer test. Most of the derivatives
showed potent spermicidal effect with minimum effective concentration (MEC) ranging from 125g/ml – 1mg/ml. The
results were further confirmed by double fluoroprobe staining with syber14/PI (Propidium Iodide). The mode of spermicidal
action was assessed by (a) Hypo-osmotic swelling tests and (b) Scanning electron microscopy. The compounds have
been found to be nontoxic to lactobacillus in 36 hours of culture whereas mild to moderately effective on common vaginal
pathogens. Taken together it can be inferred that the water-soluble salts prepared from facile technique are potential candidates
for spermicides and could further be utilized for the preparation of vaginal contraceptives.
Keywords: Furo[3, 2-h]quinoliniums, Spermicide, Microwave, Contraceptive, Scanning electron microscopy.
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