摘要:
The hetero - Diels-Alder reaction of 3-(N-acetylbenzylamino)-2-cyano-1-phenyl-2-propen-1-one (3) with enol ethers (4) leads to diastereoisomeric cycloadducts 5 and 6 in good yields. The structure of the products is discussed in terms of configuration and preferred conformation. Reaction of 5 with sulfuric acid yields 3-benzoyl-1,2-dihydropyridin-2-one (7).