Methanol → N-(4-chloro-3-methyl-1,2-oxazol-5-yl)-2-[2-(6-methyl-1,3-dihydro-2-benzofuran-5-yl)acetyl]thiophene-3-sulfonamide

Temperature

55 °C

A mixture of N-(4-chloro-3-methyl-1,2-oxazol-5-yl)-2-{2-[(6-methyl-1,3-dihydro-2-benzofuran-5-yl)methyl]-1,3-dithian-2-yl}thiophene-3-sulfonamide described in Production Example 1-7 (300 mg, 0.55 mmol), methanol (20 mL), water (2 mL) and silver nitrate (940 mg, 5.5 mmol) was stirred for 3 days at 55° C. The reaction mixture was allowed to cool to room temperature, tetrahydrofuran (40 mL) and brine (1 mL) were added at that temperature, and the mixture was filtered with Celite. The filtrate was extracted by addition of ethyl acetate (200 mL), water (100 mL) and saturated aqueous citric acid solution (1 mL). The organic layer was washed with brine and dried over anhydrous magnesium sulfate, and the solvent was distilled away under reduced pressure. The residue was purified by silica gel column chromatography (methanol:ethyl acetate=1:9), and then further purified by silica gel thin-layer chromatography (methanol:ethyl acetate=1:32) to give the title compound (45 mg, 18% yield).

1. temperatureto cool to room temperature
2. filtrationthe mixture was filtered with Celite
3. extractionThe filtrate was extracted by addition of ethyl acetate (200 mL), water (100 mL) and saturated aqueous citric acid solution (1 mL)
4. washThe organic layer was washed with brine
5. dry with materialdried over anhydrous magnesium sulfate
6. distillationthe solvent was distilled away under reduced pressure
7. customThe residue was purified by silica gel column chromatography (methanol:ethyl acetate=1:9)
8. customfurther purified by silica gel thin-layer chromatography (methanol:ethyl acetate=1:32)

ORD record

ord-813d2139ab4d448c9f8690e911711a69

Source dataset

uspto-grants-2013_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08592470B2