K. Bogdanowicz-Szwed, A. Pałasz
May 1, 2001
Citations
0
Influential Citations
10
Citations
Journal
Zeitschrift für Naturforschung B
Abstract
Abstract Cycloadditions of 3-aryl-2-benzoyl-2-propenenitriles 1a,b to styrene (2a) and its methyl or methoxy-substituted derivatives 2b-d proceed regio- and diastereoselectively yielding cis and trans diastereoisomers of 2,4,6-triaryl-3,4-dihydro-2H-pyran-5-carbonitriles 3 and 4 in 59-72% yield. Cycloadducts cis-3 were the major products. Reaction of 5-(4-nitrobenzylidene)-1,3-dimethylbarbituric acid (5) with styrenes 2a-d afforded diastereoisomeric mixtures of 2H-pyrano[2,3-d]pyrimidine-2,4(3H)-diones cis-6 and trans-7 in 71 - 78% yield.