Phosphate → (5R)-3-[6-(2-[({3-[(2,3-Dihydroimidazo[2,1-b][1,3]thiazol-6-ylmethyl)amino]-phenyl}methyl)oxy]ethoxy)hexyl]-5-(2,2-dimethyl-4H-1,3-benzodioxin-6-yl)-1,3-oxazolidin-2-one

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A solution of (5R)-3-{6-[2-{[(3-aminophenyl)methyl]oxy}ethoxy]hexyl}-5-(2,2-dimethyl-4H-1,3-benzodioxin-6-yl)-1,3-oxazolidin-2-one (200 mg) and 2,3-dihydroimidazo[2,1-b][1,3]thiazole-6-carboxaldehyde (62 mg) (WO94/10178) in dichloromethane (10 ml) was treated under nitrogen with sodium triacetoxy borohydride (340 mg) and stirred at 20° for 1.5 h. The mixture was cooled to 0°, phosphate buffer solution (pH6.5, 20 ml) was added and the mixture was extracted with EtOAc (3×30 ml). The combined organic extracts were dried (Na2SO4) and the solvent evaporated in vacuo to give a residue which was purified by SPE. Elution with dichloromethane, dichloromethane-EtOH-ammonia (400:8:1) then (225:8:1) gave the title compound (172 mg). LCMS RT=3.16 min, ES+ve 637 (MH)+.

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