Pyridine → 3-[bis(methylsulfanyl)methylene]-1-isopentyl-2,4(1H,3H)-pyridinedione

Participants

Reaction Conditions

Reaction Steps

The product of Example 457B (2.24 g, 12.37 mmol) in pyridine (8.0 mL, 98.96 mmol) and dioxane (50 mL) at 90° C. was treated with excess tris(methylthio)methyl methyl sulfate (prepared using the procedures in Synthesis, 22-25, 1988; M. Barbero, S. Cadamuro, I. Degani, R. Fochi, A. Gatti, V. Regondi), stirred at 90° C. for 1.5 hours and cooled to about 25° C. The reaction solution was decanted from the resulting solids and the solvent was removed under reduced pressure. The residue was dissolved in hexanes and loaded onto a pad of silica gel (300 mL) and eluted with hexane followed by dichloromethane then 25% ethyl acetate in dichloromethane to provide the title compound (2.42 g, 75%).

Provenance & Evidence