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Hilbert-Johnson Reactions of 2,2',4',6-Tetramethoxy-4,5'-bipyrimidine
Brown, Desmond J.,Strekowski, Lucjan
, p. 1157 - 1160 (2007/10/02)
2,2',4'6-Tetramethoxy-4,5'-bipyrimidine (1) was converted successively by methyl iodine into 2,4',6-trimethoxy-1'-methyl-4,5'-bipyrimidin-2'-one (2a), a single dimethoxy-1,1'-dimethyl-4,5'-bipyrimidinedione (3 or 4; not positively identified), 4'-methoxy-1,1',3-trimethyl-4,5'-bipyrimidine-2,2',6-trione (5) and 1,1',3,3'-tetramethyl-4,5'-bipyrimidine-2,2',4',6-tetrone (6e).Hydrolysis of the first three products gave respectively, the 1'-methyl, 1,1'-dimethyl and 1,1',3-trimethyl derivatives (6b-d) of 4,5'-bipyrimidine-2,2',4',6-tetrone.Structures were elucidated by n.m.r., ultraviolet and mass spectra.
