Water → HCID 67957852, compound

Participants

Reaction Conditions

Reaction Steps

11.1 g of 5-(4-chloro-3-nitrobenzyl)-2,2-dimethyl-1,3-dioxane-4,6-dione (contaminated by residual 1,3-diisopropylurea) were dissolved in 40 ml of THF and 40 ml (31 g) of tert-butanol, and 16.4 g (88.5 mmol) of N,N-dimethylmethyleneiminium iodide were added. The resulting suspension was stirred at 70° C. overnight and then, after cooling, added to water. The aqueous phase was extracted three times with ethyl acetate. The combined organic phases were washed with saturated sodium chloride solution, dried over magnesium sulphate and concentrated under reduced pressure. The residue was purified by chromatography on silica gel (mobile phase cyclohexane/ethyl acetate 10→50:1). This gave 8.22 g of the target product (about 78% of theory).

Provenance & Evidence