Michael reactions on conformationally flexible methyl 3-C-nitro-hex-2-enopyranoside derivatives.

@article{Sakakibara2000MichaelRO,
  title={Michael reactions on conformationally flexible methyl 3-C-nitro-hex-2-enopyranoside derivatives.},
  author={Tohru Sakakibara and Kazuo Tokuda and Tetsuji Hayakawa and Akira Seta},
  journal={Carbohydrate research},
  year={2000},
  volume={327 4},
  pages={
          489-96
        }
}
Dimethyl malonate and dibenzoylmethane attacked the C-2 position of the title 3-nitro-2-enopyranosides from the side opposite the anomeric methoxyl group to afford the 3-enopyranosides (S(N)2' products). In the case of 2,4-pentanedione and ethyl acetoacetate, further intramolecular cyclization occurred to yield dihydropyran derivatives. 
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