Some novel O,O'-diakyl-α-(6-methoxybenzothiazol-2-ylamino)-4-fluorophenylphosphonates (3) have been synthesized through the reaction of Schiff base with dialkyl phosphite. Their struc-tures were clearly established by elemental analysis, IR, ¹H NMR, ¹³C NMR and X-ray diffraction analysis. The crystal of compound 3d belongs to tetragonal with space group I4(1)/a, a＝2.1055(3) nm, b＝2.1055(3) nm, c＝2.0521(5) nm, α＝90.00°, β＝90.00°, γ＝90.00°, V＝0.9098(3) nm³, Z＝16, D_c＝1.321 mg/m³, α＝0.250 mm^－1, F(000)＝3808. There exists an intramolecular hydrogen bond [N(2)—H(2)…O(1)] in the molecule of 3d. Bioassay tests showed that compound 3f could inhibit PC3 cell proliferation at the concentration of 20 g/mL with the inhibition rate 84.3%.

Key words: α-aminophosphonate, synthesis, antitumor activity, benzothiazole