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.
Michael Addition Mediated by an Internal Catalyst. A Novel Route to 2-Diethylphosphonoalkanoic Acids
作者:Henryk Krawczyk
DOI:10.1055/s-1998-1871
日期:1998.10
Dicyclohexylammonium 2-diethylphosphonoacrylate reacts readily with a variety of 1,3-dicarbonyl and monocarbonyl pronucleophiles to give the corresponding Michael adducts. Self-catalysis in these reactions is postulated.