J. Stambach, L. Jung, R. Hug
1994
Citations
0
Influential Citations
4
Citations
Journal
Heterocycles
Abstract
β-Oxonitriles (1) are easily condensed with cyclic ketones (2a-e) in anhydrous strong acidic conditions to give 1-oxa-5-azaspiro[5.5] undec-2-en-4-ones (3a-e). In the same manner acyclic ketones (2f,g) or aldehydes (2h,i) afford 2,3-dihydro-4H-1,3-oxazin-4-ones (3f-i). The mechanism of this cyclocondensation is discussed