An efficient synthesis of α,β-unsaturated ketones based on reaction of alkenylcopper(1)reagents with selenoesters (or acylchlorides) has been elaborated.
Dimethylaluminum methaneselenolate—a useful reagent for the preparation of selenoesters. A new friedel-crafts acylation procedure promoted by Cu(I)
作者:Alan P. Kozikowski、Anthony Ames
DOI:10.1016/s0040-4020(01)96721-3
日期:1985.1
The preparation of a new aluminum reagent, dmiethylaluminum methaneselenolate (Me2AlSeMe) is described. The reactivity of this aluminum reagent toward a variety of organic substrates has been studied. Me2AlSeMe will convert O-alkyl esters to selenoesters in high yield. These selenoesters function as extremely reactive acyl transfer agents and are converted to acids, esters, and amides on reaction with
A New Method to Generate α-Aminoalkyl Radicals: Treatment of Methyl α-Amino Selenoesters with Hydride Reagents. Synthesis of 6-Azabicyclo[3.2.1]octanes by Radical Cyclization
A new method to generate α-aminoalkyl radicals and its application to the synthesis of 6-azabicyclo[3.2.1]octanes is described. α-Amino selenoesters on heating with Bu3SnH or (Me3Si)3SiH undergo decarbonylation of the initially formed acyl radical to give the corresponding α-amino radical which could be trapped intramolecularly with a double bond bearing an electron-withdrawing group.
alpha-Amino selenoester-tethered electronically poor alkenes on treatment with tributyltin hydride or TTMSS undergo intramolecular radical cyclization to provide 6-azabicyclo[3.2.1]octanes through 1-aminomethyl radical intermediates.