反应详情

The crude 3-pyridylsulfinic acid sodium salt (4.4 mmol, synthesised by variation A) was suspended in DMF (20 mL). Pyridine (0.8 mL) and ethyl α-bromoisobutyrate (1 mL) were added. The reaction was stirred at room temperature under nitrogen for 18 h. The reaction mixture was diluted with DCM (200 mL), washed with water (2×100 mL), brine (1×50 mL) and dried over Na2SO4. Filtration, concentration under reduced pressure, followed by column chromatography (silica, eluent DCM, 0-10% ethyl acetate) afforded 0.24 g of 2-methyl-2-(pyridine-3-sulfonyl)-propionic acid ethyl ester.

1. washwashed with water (2×100 mL), brine (1×50 mL)
2. dry with materialdried over Na2SO4
3. filtrationFiltration, concentration under reduced pressure