6-Dimethyl-1-phenylpyrimidin-2(1H)-one (1) reacted with methylmagnesium iodide to afford 4,6,6-trimethyl-1-phenyl-3,6-dihydropyrimidin-2(1H)-one (8a) selectively; compound (1) reacted with methyl-lithium to give mainly 4,4,6-trimethyl-1-phenyl-3,4-dihydropyrimidin-2(1H)-one (8b). The reactions of various pyrimidin-2(1H)-ones and -thiones with organometalliccompounds, and the influence of bulkiness
Controlled reduction of pyrimidin(e)-2(1H)-ones and -thiones with metal hydride complexes. Regioselective preparation of dihydro- and tetrahydro-pyrimidin-2(1H)-ones and the corresponding thiones
6-Trisubstituted pyrimidin-2(1H)-ones were easily reduced with sodium borohydride to give mixtures of 3-aryl-3,4-dihydro-, 1-aryl-3,4-dihydro-, and 3,4,5,6-tetrahydro-pyrimidin-2(1H)-ones. The ratio of the three products was dramatically dependent on the reaction conditions and on the nature of the 4- and 6-substituents in the pyrimidine ring. The reaction with lithium aluminium hydride is also discussed.
Crystal engineering of neutral N-arylpyrimidinones and their HCl and HNO3 adducts with a C–H⋯O supramolecular synthon. Implications for non-linear optics
the correct alignment of the aromatic ring in the crystal and the occurrence of 2D polar layers in some crystal structures are favourable factors for non-linearoptical applications. However, a strategy for the crystallisation of these achiral molecules in non-centrosymmetric space groups is yet to be achieved. This crystalengineering study simplifies the challenge of complete 3D structural control
1-aryl-4-(3-ethoxypropyl)-6-methylpyrimidin-2(1H)-ones (1b–d) gave the photoelimination products, 1-aryl-4,6-dimethylpyrimidin-2(1H)-ones (2a–d), via intramolecular γ-hydrogen atom abstraction of the excited imino nitrogen of the starting pyrimidin-2(1H)-one (1), in addition to the 1,3-diazabicyclo[2.2.0]hex-5-en-2-ones (3a–d). The pyrimidin-2(1H)-ones (1f) and (1h), which have no γ-hydrogens at the C-4 position