Mt. Cocco et al., REACTION OF ENAMINONITRILES WITH ISOCYANATES - SYNTHESIS OF NEW 2-OXOPYRIMIDINES AND 6-OXOPYRIMIDINES, Journal of heterocyclic chemistry, 31(2), 1994, pp. 329-334
The reaction of enaminonitriles 1 with aryl or benzyl isocyanates affo
rded C-3-5 or N-adducts 6-8 or a mixture of both depending on the subs
titution pattern of the considered enaminonitrile. The one-step synthe
sis of 6-oxopyrimidines 9-11 and 2-oxopyrimidines 12-14 by cyclization
of compounds 3-5 and 6-8 respectively is also described.