2-amino-5-[4-(difluoromethoxy)phenyl]-5-[3-(3-methoxyprop-1-yn-1-yl)phenyl]-3-methyl-3,5-dihydro-4H-imidazol-4-one → 2-Amino-5-[4-(difluoromethoxy)phenyl]-5-{3-[(1Z)-3-methoxyprop-1-en-1-yl]phenyl}-3-methyl-3,5-dihydro-4H-imidazol-4-one

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A mixture of a solution of 2-amino-5-[4-(difluoromethoxy)phenyl]-5-[3-(3-methoxyprop-1-yn-1-yl)phenyl]-3-methyl-3,5-dihydro-4H-imidazol-4-one (0.1 g, 0.25 mmol) in ethanol (1.5 mL), quinoline (1 drop) and Lindlar catalyst (24 mg. 10% mol) was placed under a hydrogen filled balloon, stirred for 16 hr filtered through celite. The filtrate was concentrated in vacuo. The resultant residue was purified by flash chromatography on silica ge,l ethyl acetate as eluent, to afford the title compound as a white solid, 0.05 g (50% yield), mp 41-44° C.; 1H NMR (DMSO-d6) δ 2.95 (s, 3H); 3.2 (s, 3H); 4.0 (d, 2H); 5.7 (q, 1H) 6.5 (d, 1H); 6.6 (b, 2H); 7.1 (m, 3H); 7.3 (m, 4H); 7.4 (d, 2H); MS [(+)ESI] m/z=402 [M−H]+.

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