Self-catalytic Michael reaction of enolizable carbonyl compounds. A facile route to α-methylene-δ-valerolactones
作者:Henryk Krawczyk、Marcin Śliwiński
DOI:10.1016/j.tet.2003.09.039
日期:2003.11
2-phosphono-5-oxoalkanoates 3 were prepared by the Michaelreaction of enolizable carbonylcompounds with the acrylate 1. The corresponding 2-phosphono-5-oxoalkanoic acids 4 were converted into α-phosphono-δ-valerolactones 6. The products were shown to be useful substrates for the synthesis of α-methylene-δ-valerolactones 7 by the Horner–Wadsworth–Emmons reaction.
Carlson, Robert M.; White, Linda L., Synthetic Communications, 1983, vol. 13, # 3, p. 237 - 242
作者:Carlson, Robert M.、White, Linda L.
DOI:——
日期:——
Carbonylation of alkynols catalyzed by Pd(II)/2-PyPPh 2 dissolved in organic solvents and in ionic liquids: a facile entry to α-methylene γ- and δ-lactones
作者:Crestina S Consorti、Gunter Ebeling、Jaı̈rton Dupont
DOI:10.1016/s0040-4039(01)02309-7
日期:2002.1
The carbonylation of terminal 3-alkyn-1-ols and 1-alkyn-4-ols by Pd(OAc)(2) associated with 2-(diphenylphosphino)pyridine (2-PyPPh2) dissolved in organic solvents or in 1-n-butyl-3-methyl imidazolium ionic liquids affords quantitatively and selectively exo-alpha-methylene gamma- and delta-lactones, respectively. In the case of the reactions performed in ionic liquids (biphasic conditions), the lactones were isolated by simple distillation and the ionic catalyst solution can be reused. (C) 2002 Elsevier Science Ltd. All rights reserved.
Synthetic methods. 36. Utilization of ethyl 2-((phenylsulfonyl)methyl)acrylate for the synthesis of .alpha.-methylenevalerolactones
作者:Eugene Ghera、Tamar Yechezkel、Alfred Hassner
DOI:10.1021/jo00311a014
日期:1990.11
Intramolecular carbonylation of vinyl halides to form methylene lactones