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The 5,6,7,8-tetrahydronaphthalen-2-amine (10 g; 68 mmol) and dimethyl acetylsuccinate (11.6 g; 62 mmol) were mixed together, placed in a dessicator and the homogeneous mixture was stirred under vacuum (3 mbars) for 3 days. Purification by flash chromatography on silica gel using a gradient of ethyl acetate (1 to 20%) in heptane furnished 12.9 g (60%) of dimethyl 2-(1-(5,6,7,8-tetrahydronaphthalen-2-ylamino)ethylidene)succinate as a deep orange oil.

1. customPurification by flash chromatography on silica gel using a gradient of ethyl acetate (1 to 20%) in heptane