Pyrimidines. 71. Rearrangements of 2,2′,4-trimethoxy-6′-phenyl-4′,5-dipyrimidinyl to n-methyl oxo derivatives
A trimethoxy derivative with three nonequivalent methoxy groups was obtained from 2,2′, 4-trichloro-6′-phenyl-4′ 5-dipyrimidinyl. Rearrangement of 2,2′, 4-trimethoxy-6′-phenyl-4′, 5-dipyrimidinyl under Hubert-Johnson conditions and thermal rearrangement with and without a catalyst make it possible to obtain 2′,4-dimethoxy-1-methyl-2-oxo-and 2′-methoxy-1,3-dimethy1-2,4-dioxodipyrimidinyls and both tri-N-methyl isomers, viz., the 1,1′, 3-and 1,3,3′-trimethyl derivatives. The possibility of obtaining N-methyl derivatives of trioxodipyrimidinyl by methylation under various conditions was also examined.