N. Martin et al., STEREOCONTROLLED ROUTES TO DERIVATIVES OF CARBONYL-2-AMINO-4-ARYL-5-CYANO-6-PHENYL-4H-PYRANS, Tetrahedron : asymmetry, 6(1), 1995, pp. 255-262
The asymmetric Michael addition of cyanoacetates 2b-e and benzoylaceto
nitrile 6 to alpha-benzoylcinnamonitrile 3 and alpha-cyanocinnamates 7
b-e, respectively, has been studied. The resulting carbonyl-2-amino-4-
aryl-5-cyano-6-phenyl-4H-pyrans 4b-e have been obtained in moderate di
astereomeric excess and good chemical yield.