5-Ethyl-2,4(1H,3H)-pyrimidinedione → 2-chloro-5-ethyl-3H-pyrimidin-4-one

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The title compound was prepared in 67% yield from 5-Ethyl-1H-pyrimidine-2,4-dione utilizing a method analogous to the preparation of 2-chloro-5,6-dimethyl-3H-pyrimidin-4-one (see Lee, et al., WO 9605177). 1H NMR (400 MHz, DMSO-d6): δ 13.21 (br s, 1H), 7.90 (br s, 1H), 2.39 (q, 2H, J=7.6 Hz), 1.08 (t, 3H, J=7.6 Hz). MS (ES) [m+H] calc'd for C6H7N2OCl, 159, 161; found 159, 161.

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