The syntheses of all eugenol derivatives in this research have
been focused on simple O-alkylation at hydroxy group of eugenol.
From the preliminarily study, it was found that the allyl moiety is the
most necessary for anesthetic activity. Therefore, the modification
should be done on other part of eugenol which hydroxyl group is
easily modified by alkylated with various hydrocarbon chains. The
alkyl chain was divided into two groups as ethyl, butyl and hexyl for
linear chain and sec-butyl and isopropyl group for branch chain
resulting in the increase of hydrophobicity in molecule. The Oalkylation
reaction of eugenol was carried out in one step starting with
eugenol and alkyl halides and potassium carbonate as reagent in
acetone at reflux temperature [10], the results were shown in Table 1.