Regioselectivity in the Reaction of Ethyl Diethoxyphosphorylacetate with 1-Aryl-2-haloalkan-1-ones: Effective Synthesis of 4-Aryl-2-diethoxyphosphoryl-4-oxobutanoates
Synthesis and cytotoxic activity of γ-aryl substituted α-alkylidene-γ-lactones and α-alkylidene-γ-lactams
作者:Anna Albrecht、Jacek F. Koszuk、Jakub Modranka、Marek Różalski、Urszula Krajewska、Anna Janecka、Kazimierz Studzian、Tomasz Janecki
DOI:10.1016/j.bmc.2008.03.035
日期:2008.5
A series of 5-aryl-3-alkylidenedihydrofuran-2(3H)-ones 6a-g'' and 11a,b as well as 5-aryl-3-methylidenepyrrolidin-2-ones 10a-c and 12 were synthesized starting from 4-aryl-2-diethoxyphosphoryl-4-oxobutanoates 3a-g. Reaction sequence includes reduction or reductiveamination of the carbonyl group, lactonization or lactamization step and finally the Horner-Wadsworth-Emmons olefination of aldehydes using
Regioselectivity in the Reaction of Ethyl Diethoxyphosphorylacetate with 1-Aryl-2-haloalkan-1-ones: Effective Synthesis of 4-Aryl-2-diethoxyphosphoryl-4-oxobutanoates
作者:Tomasz Janecki、Jacek Koszuk、Anna Albrecht
DOI:10.1055/s-2007-966060
日期:2007.6
The regioselectivity of the reaction of ethyl diethoxyphosphorylacetate with 1-aryl-2-haloalkan-1-ones has been investigated. It has been found that, depending on the nature of the halogen atom in 1-aryl-2-haloalkan-1-ones and the reaction conditions, alkylation or olefination products can be obtained with excellent or even full selectivity.
A simple, two-step synthesis of 4,6-disubstituted pyridazin-3(2H)-ones starting from 2-diethoxyphosphoryl-4-oxoalkanoates and hydrazines is described. The intermediate 4-diethoxyphosphoryl-4,5-dihydropyridazin-3(2H)-ones obtained in this way are used in a Horner-Wadsworth-Emmons olefination of aldehydes to give a variety of disubstituted pyridazin-3(2H)-ones.