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3-[(4-Hydroxy-cyclohexyl)-(4-methyl-cyclohexanecarbonyl)-amino]-5-phenyl-thiophene-2-carboxylic acid methyl ester (27 mg, 0.059 mmol) was dissolved in THF (0.6 ml), cooled to 0° C. in an ice bath and 60% sodium hydride (5 mg, 0.118 mmol) was added, followed by a catalytic amount of tetrabutylammonium iodide. After stirring for 1 hour, iodomethane (37 ul, 0.590 mmol) was added and the reaction further stirred for 3 hours. It was then quenched with water (5 ml) and extracted with ethyl acetate (3×5 ml). The combined ethyl acetate layer was dried (Na2SO4) and concentrated. The residue was purified by preparative chromatography (10% MeOH/CH2Cl2) to obtain 5 mg (18%) of 3-[(4-Methoxy-cyclohexyl)-(4-methyl-cyclohexanecarbonyl)-amino]-5-phenyl-thiophene-2-carboxylic acid (compound 46).

1. customthe reaction
2. stirringfurther stirred for 3 hours
3. customIt was then quenched with water (5 ml)
4. extractionextracted with ethyl acetate (3×5 ml)
5. dry with materialThe combined ethyl acetate layer was dried (Na2SO4)
6. concentrationconcentrated
7. customThe residue was purified by preparative chromatography (10% MeOH/CH2Cl2)