Phthalamic acid → N'-(1-Carbamoyl-1,2-dimethylpropyl)-N,N-diethyl-3,4-(methylenedioxy)phthalamide

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A solution of N,N-diethyl-5,6-)methylenedioxy)phthalamic acid (3.00 g, 11.0 mmol) in tetrahydrofuran, under nitrogen at room temperature is treated with ethyl chloroformate (1.10 mL, 11.0 mmol), cooled to 10° C., treated with triethylamine (1.70 mL, 12.0 mmol), stirred for 30 minutes at 10° C., treated dropwise with a solution of α-methylvalinamide (1.43 g, 11.0 mmol) in tetrahydrofuran, stirred overnight at ambient temperatures, treated with water and concentrated in vacuo. The aqueous residue is extracted with ethyl acetate; the extracts are combined, washed with brine and saturated sodium bicarbonate, dried (MgSO4), and concentrated in vacuo to afford the title product as an amber foam 3.10 g (74.7%), identified by NMR and mass spectral analysis.

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