The Meerwein-Ponndorf-Verley reduction of pyrimidin-2(1H)-ones using tetraisopropoxyzirconium or tri-isopropoxyaluminium leads to exclusive formation of the 3,4-dihydro isomer. The former reducing agent is found to be the more effective.
T. Høseggen, F. Rise and K. Undheim, J. Chem. Soc., Perkin Trans. 1, 1986, 849 DOI: 10.1039/P19860000849
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