5-Endo-trigonal reactions: a disfavoured ring closure
作者:Jack E. Baldwin、John Cutting、William Dupont、Lawrence Kruse、Lee Silberman、Richard C. Thomas
DOI:10.1039/c39760000736
日期:——
A number of polyfunctional molecules have been examined as substrates for the 5-Endo-Trigonal ring-forming reaction, and it has been found that for first-row elements this is a disfavoured process, alternative reactions of type 5-Exo-Trig generally taking precedence; one case of a 5-Endo-Trig closure for a second-row element, sulphur, has been found.
On the reaction of sterically hindered α,β-unsaturated ketones with hydroxylamine: preparation of 5-hydroxy derivatives of isoxazolidine and 4,5-dihydroisoxazole
作者:M. V. Mavrov、S. I. Firgang
DOI:10.1007/s11172-012-0088-4
日期:2012.3
A reaction of hydroxylamine with α,β-unsaturated ketones containing a tertiary carbon atom α to the keto group leads to 5-hydroxyisoxazolidine and 5-hydroxy-Δ2-isoxazoline derivatives.
Synthesis of 4-aryl-1,7-dihydroxyalkane-2,6-diones under aldol reaction conditions
作者:M. V. Mavrov
DOI:10.1007/s11172-016-1361-8
日期:2016.3
Reactions of 3-hydroxyalkan-2-ones with (hetero)aromatic aldehydes under basic conditions lead to 4-aryl-1,7-dihydroxyalkane-2,6-diones. These products were also synthesized by dismutation of 4-aryl-1-hydroxyalk-3-ene-2-ones. The reactions proceed as tandem retro aldolreactions and the Michael addition.