3-(2-[1,3]dioxolan-2-yl-ethyl)-1H-quinazoline-2,4-dione → 3-[2,4-dioxo-1,4-dihydro-2H-quinazolin-3-yl]propionaldehyde

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A solution of 3-(2-[1,3]dioxolan-2-yl-ethyl)-1H-quinazoline-2,4-dione (0.11 g, 0.43 mmol) 10% sulfuric acid (10 mL) and Acetone (10 mL) was stirred at ambient temperature for 24 hours. Concentration yielded 3-[2,4-dioxo-1,4-dihydro-2H-quinazolin-3-yl]propionaldehyde (0.09 g, 95%) as an off-white solid. 1H NMR CDCl3 δ9.85 (s, 1H), 8.10-8.06 (m,1H), 7.63-7.57 (m, 1H), 7.24-7.19 (m, 1H), 7.13-7.07 (m, 1H), 4.44-4.40 (m, 2H), 2.85 (dt, 2H, J1,2=2 Hz, J1,3=7 Hz).

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