Silver-mediated radical cyclization: construction of Δ2-isoxazolines from α-halo ketoximes and 1,3-dicarbonyl compounds
作者:Yan-Yun Liu、Xu-Heng Yang、Ji Yang、Ren-Jie Song、Jin-Heng Li
DOI:10.1039/c4cc02084g
日期:——
A novel route to Delta(2)-isoxazolines is presented via silver-mediated radical cyclization of alpha-halo ketoximes with 1,3-dicarbonyl compounds. This method is performed using a radical strategy, and represents a new example of silver-initiated generation of oxime radicals for the formation of the C(sp(3))-O bonds.
eutectic solvents (DESs) is described. Treatment of aromatic α-chloro oximes with aliphatic amines at 110 °C in choline chloride based DESs resulted in a straightforward and efficient assembly of 1,3,5-trisubstituted-2(1H)-pyrazinones. The protocol, featuring mild reaction conditions and avoiding common volatile organic solvents, affords a safe and sustainable approach to original peptidomimetic scaffolds