Heterocycles p. 1079 - 1097 (2005)
Update date:2022-08-04
Topics:
Corsaro, Antonino
Pistara, Venerando
Rescifina, Antonio
Chiacchio, Maria A.
Piperno, Anna
Romeo, Giovanni
Methoxypyrimidines preferentially add to benzonitrile oxide to give cycloadducts to their C=N double bonds. These, however, lose benzonitrile affording the corresponding pyrimidones. Cycloadditions to their C=C double bonds take place to a very low extent, and products generally undergo a ring opening process which affords the corresponding oximes. Pyrimidones preferentially give addition products to their nitrogen atoms, and only in the case of 4-pyrimidone, the cycloadduct to its C=C double bond was isolated.
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