合成路线1

In the original synthesis of the title compound, Knoevenagel condensation of benzaldehyde (I) with malonic acid (II) in the presence of ammonium acetate produced the beta-aminoacid (III). Reductive alkylation of the amino group of (III) with formaldehyde produced the dimethyl amine (IV). Then, Fischer esterification of (IV) with ethanolic HCl furnished the intermediate amino ester (V). Amino ester (V) was alternatively obtained by Michael addition of dimethylamine to ethyl cinnamate (VI). Reduction of the ester function of (V) provided amino alcohol (VII). The sodium alkoxide of (VII) was then coupled with 1-fluoronaphthalene (VIII) to produce the racemic amino ether, which was finally resolved into enantiomers by means of tartaric acid.