Triethylamine → 5-(1-Amino-2-cyclopropyl-ethylidene)-2,2-dimethyl-[1,3]dioxane-4,6-dione

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Reaction Steps

1 g (7 mmol) 2-Cyclopropyl-acetimidic acid methyl ester hydrochloride, 963 mg (7 mmol) 2,2-dimethyl-[1,3]dioxane-4,6-dione and 1.07 ml (8 mmol) triethylamine were heated under reflux in 7 ml chloroform for 14 h. The mixture was diluted with dichloromethane, washed neutral with brine/ice water 1/1 and the organic layer was dried over sodium sulfate. The solvent was removed under reduced pressure and the residue purified by flash chromatography (silica gel, heptane/AcOEt) to give 128 mg (0.6 mmol, 9%) of the title compound as yellow crystals.

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