反应详情

To a solution of (S)-methyl 2-(2-amino-7-(4-chlorophenyl)-5-methylbenzo[d]thiazol-6-yl)-2-tert-butoxyacetate (40 mg, 0.1 mmol) in acetonitrile (1 mL) was added 2,5-dimethoxy-2,5-dihydrofuran (26 μL, 0.2 mmol), followed by hydrochloric acid (0.2 N, 0.8 mL, 0.16 mmol). The mixture was stirred for 24 hours, and was diluted with EtOAc and quenched with saturated sodium bicarbonate solution. The organic layer was separated, and was washed with water and brine, dried with sodium sulfate and filtered. Concentration and purification by flash column chromatography (hexanes/EtOAc) gave (S)-methyl 2-tert-butoxy-2-(7-(4-chlorophenyl)-5-methyl-2-(2-oxo-2,5-dihydro-1H-pyrrol-1-yl)benzo[d]thiazol-6-yl)acetate. LCMS-ESI+: calc'd for C25H25ClN2O4S: 485.1 (M+H+); Found: 485.2 (M+H+).

1. customquenched with saturated sodium bicarbonate solution
2. customThe organic layer was separated
3. washwas washed with water and brine
4. dry with materialdried with sodium sulfate
5. filtrationfiltered
6. concentrationConcentration and purification by flash column chromatography (hexanes/EtOAc)