Hydrochloric Acid → 5-(2-oxo-1,2-dihydro-pyridin-4-ylmethyl)-2-thioxo-2,3-dihydro-1H-pyrimidin-4-one

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Reaction Conditions

Reaction Steps

5-(2-Methoxy-pyridin-4-ylmethyl)-2-thioxo-2,3-dihydro-1H-pyrimidin-4-one (900 mg, 3.61 mmol, 1 eq) was refluxed in an acetic acid, glacial (12 ml)/HCl conc. (12 ml) mixture for 7 hours. (150° C. on display of heating device). Solvent from the mixture was evaporated as much as possible. In the mixture was added 20 ml of water. pH of the mixture was adjusted to 4-5. The resulting precipitate was collected and was dried. It was obtained 5-(2-Oxo-1,2-dihydro-pyridin-4-ylmethyl)-2-thioxo-2,3-dihydro-1H-pyrimidin-4-one (645 mg, yield=72.1%, purity=95%) in form of white powder. MS: [M+H]+=236.15 1H NMR (300 MHz; DMSO-d6) δ/ppm 3.36 (s, 2H), 6.06 (dd, J=6.81 Hz, J=1.60 Hz, 1H), 6.11 (s, 1H), 7.24 (d, J=6.81 Hz, 1H), 7.43 (d, J=5.66 Hz, 1H), 11.36 (br.s, 1H), 12.30 (d, J=4.89 Hz, 1H), 12.52 (br.s, 1H)

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