Description
4,6-Dimethyl-2-hydroxypyrimidine (4,6-DHP) is a synthetic pyrimidine analogue classified as a functional nutritional compound[6]. The hydrochloride salt serves as a precursor for synthesizing 4,6-dimethyl-2-chloropyrimidine via reaction with phosphorus oxychloride[4]. It acts as a ligand in coordination chemistry, reacting with copper(II) perchlorate in aqueous ammonia to form [(NH3)2Cu(dmpymo)](ClO4)·2H2O, and with palladium complexes to yield [(dach)Pd(2-dmpymo)]4(NO3)4[5][7].
Synthesis
IM06: Synthesis of 4,6-dimethylpyrimidin-2-one
Step 1: Urea (20.0 g, 333.3 mmol) and acetylacetone (33.3 g, 333.3 mmol) were dissolved in ethanol (166 mL), followed by the slow addition of concentrated aqueous hydrochloric acid solution (45 mL). The reaction mixture was stirred at 80 °C for 24 hours. Upon completion of the reaction, the mixture was cooled to room temperature, the precipitate was collected by filtration and washed with cold ethanol to afford 4,6-dimethylpyrimidin-2-ol as a colorless solid (40 g, 97% yield). The product was characterized by 1H NMR (DMSO-d6, 400 MHz): δ 7.35 (1H, s), 2.43 (6H, s).
References
[1] Patent: US2013/5743, 2013, A1. Location in patent: Page/Page column 12
[2] Patent: WO2013/4617, 2013, A1. Location in patent: Page/Page column 30
[3] European Journal of Inorganic Chemistry, 2018, vol. 2018, # 23, p. 2695 - 2701
[4]
Vlád, G., Horváth, I. T. (2002). Improved Synthesis of 2,2‘-Bipyrimidine. The Journal of Organic Chemistry, 67(18), 6550–6552.
https://doi.org/10.1021/jo0255781 [5]
Tabares, L. C., Navarro, J. A., Salas, J. M., Willermann, M. (2001). One-dimensional compounds containing copper(II) ions symmetrically bridged by 2-oxo-pyrimidinate. Crystal structure and magnetic behaviour. Inorganica Chimica Acta, 318(1-2), 166–170.
https://doi.org/10.1016/s0020-1693(01)00409-1 [6]
Kumar, A., Kumar, S., Kumar, S. (2026). Pyrimidine analogues present a plausible regulatory framework for reproduction in the freshwater catfish Heteropneustes fossilis. Discover Animals, 3(1).
https://doi.org/10.1007/s44338-026-00217-8 [7]
Barea, E., Navarro, J. A. R., Salas, J. M., Quirós, M., Willermann, M., Lippert, B. (2003). Chiral Pyrimidine Metallacalixarenes: Synthesis, Structure and Host–Guest Chemistry. Chemistry – A European Journal, 9(18), 4414–4421.
https://doi.org/10.1002/chem.200305183
