The title heterocycle is prepared in enantiomerically pure form and in 46-50% overall yield from (S)-asparagine, a readily available starting material. The synthetic route described in this report represents a major improvement over the original procedure (Tetrahedron: Asymmetry 1991, 3, 723), that afforded a 24-32% overall yield. Furthermore, the use of toxic reagents such as Pb(OAc)4and dimethyl sulfate is avoided in the present protocol. © 2003 Published by Elsevier Science Ltd.
Iglesias-Arteaga, M. A., Castellanos, E., & Juaristi, E. (2003). Alternative procedure for the synthesis of enantiopure 1-benzoyl-2(S)-tert-butyl-3-methylperhydropyrimidin-4-one, a useful starting material for the enantioselective synthesis of α-substituted β-amino acids. Tetrahedron Asymmetry, 14(5), 577–580. https://doi.org/10.1016/S0957-4166(03)00048-X