Sterically hindered 1,3-diketones in the Michael reaction
作者:I. E. Sokolov、A. S. Zanina、S. I. Shergina、M. S. Shvartsberg
DOI:10.1007/bf01433748
日期:1996.1
The base catalyzed addition of sterically hindered 1,3-diketones to the activated multiple bond of ethyl acrylate and 4-methyl-4-methoxy-1-phenylpent-2-yne-1-one has been studied. The addition of methyl(2-propenyl)ketone is partially accompanied by intramolecular cyclization of the resulting adduct.
Alkylation of sterically hindered 1,3-diketones under phase-transfer conditions
作者:A. S. Zanina、S. I. Shergina、I. E. Sokolov、M. S. Shvartsberg
DOI:10.1007/bf01435389
日期:1996.10
Sterically hindered 1,3-diketones react selectively with propargyl and allyl bromides under conditions of phase transfer catalysis to give C-alkylated products, whereas reactions with butyl and benzyl chlorides yield mixtures of C- and O-isomers. Gn increase in the size of the substituents present in the initial 1,3-diketone hampers introduction of the second propargyl group. The propargyl-substituted 1,3-diketones undergo cyclization under the alkylation conditions to give substituted furans.
Kandybin; Belaya; Malkova, Russian Journal of General Chemistry, 1999, vol. 69, # 6, p. 866 - 875