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.
Synthesis of 1,4,6-Trisubstituted 2[1H]-Pyrimidineselenones
作者:Alicja Zylewska、Waldemar Tejchman、Maria J. Korohoda、Marek Zylewski
DOI:10.3987/com-03-9865
日期:——
1,6-Diaryl-4-methyl-2[1H]-pyrimidineselenones and 1,4-diaryl-6methyl-2[1H]-pyrimidineselenones were synthesised by treatment of appropriate pyrimidinethiones with gaseous H2Se. 2D NMR spectroscopic studies were conducted to obtain conformations of the newly synthesised derivatives.