H. Abdelghany et al., SYNTHESIS OF SOME NEW SPIRO HETEROCYCLES FROM THE REACTION OF 2-COUMARYLIDENEMALONONITRILE WITH ACTIVE METHYLENE AND BIDENTATE REAGENTS, Synthetic communications, 28(18), 1998, pp. 3431-3441
The reaction of 2-Coumarylidenemalononitriles 1a,b with some active me
thylene, bidentates and ketoketene S, S or N, S acetals affords a seri
es of new spiro heterocyclic systems.