M. Nakagawa et al., EFFICIENT MICHAEL ADDITION-REACTIONS OF THE N-ARYLSULFONYL-3-PHENYLTHIOPIPERIDONES - SYNTHESIS OF 3-SUBSTITUTED DIHYDROPYRIDINONES, Heterocycles, 35(2), 1993, pp. 1157-1170
Efficient methods for the Michael addition reactions of N-arylsulfonyl
-3-phenylthiopiperidones (1) with both the protected amidoacrylates (4
, 9) and the simple acrylates (12) have been developed. These reaction
s offer an efficient route to the 3-alkyl-substituted dihydropyridinon
es (3, 11), the dienophiles employed in the natural product synthesis.