Vilsmeier–Haack reactions of carbonyl compounds: synthesis of substituted pyrones and pyridines
作者:Ajith Dain Thomas、Josemin、C.V Asokan
DOI:10.1016/j.tet.2004.04.017
日期:2004.5
Vilsmeier–Haack reaction of substituted phenylacetones leads to the formation of conjugated iminium salts which on aqueous basic work up afford 3-formyl-4-pyrones and on ammonium acetate-induced cyclization afford 5-aryl-4-chloronicotinaldehydes in good yields.