A Facile One-Pot Synthesis of α-Halo-α-allyl-aldehydes from α,α-Dihaloketones Using Allylsamarium Bromide and DMF
作者:Songlin Zhang、Jucai Di
DOI:10.1055/s-2008-1078418
日期:2008.6
A convenient, one-pot synthesis of a range of α-halo-α-allyl aldehydes is described. The protocol involves the reaction of allylsamarium bromide with various α,α-dihalo ketones. A possible mechanism of the transformation is proposed.
A Facile Synthesis of Two Series
of Multifunctional Carbon Compounds from α,α-Dihalo
Ketones Using Allylsamarium Bromide
作者:Songlin Zhang、Xiaodan Liu、Jucai Di
DOI:10.1055/s-0029-1216913
日期:——
presented. With DMF, α-halo-α-allyl aldehydes were obtained, while α-hydroxy-α-allyl aldehyde acetals were obtained in the presence of NaOMe/MeOH . samarium - aldehydes - acetals - rearrangement - synthesis
However, when the aqueous solution contained NaOH, two α-mono-halide ketone molecules had a special dimer condensation. The reaction mechanisms were explored by conducting GC-MS, EPR, and CV with DFT calculations. These revealed that in situ generation of a halogen radical initiated electrocatalytic halogenation, while the dimer condensation involved a hydroxyl radical-mediated C1 fragment elimination.