Bicyclo[2.2.1]heptane-1-methanesulfonic acid, 7,7-dimethyl-2-oxo-, (1S)- → 1-Methyl-1-(1-methylpiperidin-4-yl)-3-{4-[4-(3-phenylacetylthioureido)phenoxy]pyridin-2-yl}urea

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Reaction Steps

3-[4-(4-Aminophenoxy)pyridin-2-yl]-1-methyl-1-(1-methylpiperidin-4-yl)urea (60 mg) was dissolved in ethanol (1 ml) while stirring, and then D-10-camphorsulfonic acid (39.3 mg) was added thereto under a nitrogen atmosphere, followed by stirring for 5 min. Phenylacetyl isothiocyanate (toluene solution, 1.82 M, 0.074 ml) was added thereto, followed by stirring further for 1.5 hrs. The reaction mixture was partitioned between ethyl acetate (30 ml) and a saturated aqueous solution of sodium hydrogencarbonate (20 ml). The organic layer was washed with a saturated aqueous solution of sodium hydrogencarbonate, water and brine in this order, and dried over anhydrous sodium sulfate. The solvent was evaporated to give a residue, which was then purified by silica gel column chromatography (Fuji Silysia NH, eluent; hexane:ethyl acetate=1:5, then ethyl acetate). Fractions containing the crude product were concentrated to give a residue, which was then purified by LC-MS. The fractions containing the target compound were concentrated to give a residue, to which a saturated aqueous solution of sodium hydrogencarbonate was added to extract with ethyl acetate. The organic layer was separated, dried over anhydrous sodium sulfate. The solvent was evaporated to give a residue, which was then purified by silica gel column chromatography (Fuji Silysia NH, eluent; ethyl acetate, then ethyl acetate:ethanol=9:1). Fractions containing the target compound were concentrated to give a residue, to which diethyl ether (0.3 ml)-hexane (0.1 ml) was then added to suspend. The solid was filtered off and dried under aeration to provide the titled compound (2.0 mg, 2.2%) as a white solid.

Provenance & Evidence