1984 Volume 32 Issue 5 Pages 2005-2010
The condensation of 2, 4 (2, 6)-dimethylpyrimidines (7a-c), but not 6-methoxy-2, 4-dimethylpyrimidine (7d), with benzaldehyde in the presence of zinc chloride occurred at the 4 (6)-methyl group predominantly. In contrast, the reaction of 7d under the same conditions gave 6-methoxy-4-methyl-2-styrylpyrimidine (17) as the main product. Similar site-selectivity in the oxidation of the dimethylpyrimidines with selenium dioxide was found.